yaml2attrs/fromYAML results in IFD causing nix flake check to fail

[montchr]

This particular chain of functions in yaml2attrs leads to IFD, as it forces the derivation to be evaluated before anything else can continue because we need to builtins.readFile from the resulting file.

base16.nix/default.nix

Lines 108 to 113 in 6b404cd

	yaml2attrs = yaml:
	builtins.fromJSON (builtins.readFile (pkgs.stdenv.mkDerivation {
	name = "fromYAML";
	phases = [ "buildPhase" ];
	buildPhase = "${pkgs.yaml2json}/bin/yaml2json < ${yaml} > $out";
	}));

Because stdenv is system-specific, that chain of requirements leads to requiring cross-compilation in order to simply run nix flake check.

It does not appear to be possible to run nix flake check on a flake containing both aarch64-darwin and x86_64-linux host configurations.

$ nf check --show-trace
trace: namaka={"dir":"tests","results":{"ops__keys":true,"ops__metadata":true}}
warning: unknown flake output '__std'
Failed to find a machine for remote build!
derivation: lm95hkshyfvyisjcxs17z4kx5mrcc3md-fromYAML.drv
required (system, features): (x86_64-linux, [])
1 available machines:
(systems, maxjobs, supportedFeatures, mandatoryFeatures)
([aarch64-linux], 4, [kvm], [])
error:
       … while checking flake output 'nixosConfigurations'

         at «none»:0: (source not available)

       … while checking the NixOS configuration 'nixosConfigurations.freundix'

         at «none»:0: (source not available)

       … while calling the 'seq' builtin

         at /nix/store/38rzi6kzh5ilbpdgpvd8aj34vksgkcfa-source/lib/modules.nix:326:18:

          325|         options = checked options;
          326|         config = checked (removeAttrs config [ "_module" ]);
             |                  ^
          327|         _module = checked (config._module);

       … while evaluating a branch condition

         at /nix/store/38rzi6kzh5ilbpdgpvd8aj34vksgkcfa-source/lib/modules.nix:267:9:

          266|       checkUnmatched =
          267|         if config._module.check && config._module.freeformType == null && merged.unmatchedDefns != [] then
             |         ^
          268|           let

       … in the right operand of the AND (&&) operator

         at /nix/store/38rzi6kzh5ilbpdgpvd8aj34vksgkcfa-source/lib/modules.nix:267:72:

          266|       checkUnmatched =
          267|         if config._module.check && config._module.freeformType == null && merged.unmatchedDefns != [] then
             |                                                                        ^
          268|           let

       … while evaluating the attribute 'unmatchedDefns'

         at /nix/store/38rzi6kzh5ilbpdgpvd8aj34vksgkcfa-source/lib/modules.nix:671:7:

          670|       # Transforms unmatchedDefnsByName into a list of definitions
          671|       unmatchedDefns =
             |       ^
          672|         if configs == []

       … while calling the 'concatLists' builtin

         at /nix/store/38rzi6kzh5ilbpdgpvd8aj34vksgkcfa-source/lib/modules.nix:678:11:

          677|         else
          678|           concatLists (mapAttrsToList (name: defs:
             |           ^
          679|             map (def: def // {

       … while calling anonymous lambda

         at /nix/store/38rzi6kzh5ilbpdgpvd8aj34vksgkcfa-source/lib/attrsets.nix:539:10:

          538|     attrs:
          539|     map (name: f name attrs.${name}) (attrNames attrs);
             |          ^
          540|

       … from call site

         at /nix/store/38rzi6kzh5ilbpdgpvd8aj34vksgkcfa-source/lib/attrsets.nix:539:16:

          538|     attrs:
          539|     map (name: f name attrs.${name}) (attrNames attrs);
             |                ^
          540|

       … while calling anonymous lambda

         at /nix/store/38rzi6kzh5ilbpdgpvd8aj34vksgkcfa-source/lib/modules.nix:678:46:

          677|         else
          678|           concatLists (mapAttrsToList (name: defs:
             |                                              ^
          679|             map (def: def // {

       … while calling anonymous lambda

         at /nix/store/38rzi6kzh5ilbpdgpvd8aj34vksgkcfa-source/lib/modules.nix:664:22:

          663|         # Propagate all unmatched definitions from nested option sets
          664|         mapAttrs (n: v: v.unmatchedDefns) resultsByName
             |                      ^
          665|         # Plus the definitions for the current prefix that don't have a matching option

       … while calling anonymous lambda

         at /nix/store/38rzi6kzh5ilbpdgpvd8aj34vksgkcfa-source/lib/attrsets.nix:539:10:

          538|     attrs:
          539|     map (name: f name attrs.${name}) (attrNames attrs);
             |          ^
          540|

       … from call site

         at /nix/store/38rzi6kzh5ilbpdgpvd8aj34vksgkcfa-source/lib/attrsets.nix:539:16:

          538|     attrs:
          539|     map (name: f name attrs.${name}) (attrNames attrs);
             |                ^
          540|

       … while calling anonymous lambda

         at /nix/store/38rzi6kzh5ilbpdgpvd8aj34vksgkcfa-source/lib/modules.nix:678:46:

          677|         else
          678|           concatLists (mapAttrsToList (name: defs:
             |                                              ^
          679|             map (def: def // {

       … while calling anonymous lambda

         at /nix/store/38rzi6kzh5ilbpdgpvd8aj34vksgkcfa-source/lib/modules.nix:664:22:

          663|         # Propagate all unmatched definitions from nested option sets
          664|         mapAttrs (n: v: v.unmatchedDefns) resultsByName
             |                      ^
          665|         # Plus the definitions for the current prefix that don't have a matching option

       … while calling anonymous lambda

         at /nix/store/38rzi6kzh5ilbpdgpvd8aj34vksgkcfa-source/lib/modules.nix:594:46:

          593|       # an attrset 'name' => list of submodules that define ‘name’.
          594|       defnsByName = byName "config" (module: value:
             |                                              ^
          595|           map (config: { inherit (module) file; inherit config; }) (pushDownProperties value)

       … from call site

         at /nix/store/38rzi6kzh5ilbpdgpvd8aj34vksgkcfa-source/lib/modules.nix:595:69:

          594|       defnsByName = byName "config" (module: value:
          595|           map (config: { inherit (module) file; inherit config; }) (pushDownProperties value)
             |                                                                     ^
          596|         ) configs;

       … while calling 'pushDownProperties'

         at /nix/store/38rzi6kzh5ilbpdgpvd8aj34vksgkcfa-source/lib/modules.nix:826:24:

          825|   */
          826|   pushDownProperties = cfg:
             |                        ^
          827|     if cfg._type or "" == "merge" then

       … from call site

         at /nix/store/fxgkj2xxcz9pn5khyq9f0ddyfpiw854y-source/stylix/palette.nix:128:26:

          127|     # https://github.com/SenchoPens/base16.nix#mktheme
          128|     lib.stylix.colors = (base16.mkSchemeAttrs cfg.base16Scheme).override override;
             |                          ^
          129|     lib.stylix.scheme = base16.mkSchemeAttrs cfg.base16Scheme;

       … while calling 'mkSchemeAttrs'

         at /nix/store/c4ri83y4ka8q5ad1i9b278vp2qch2xx1-source/default.nix:190:5:

          189|     # (see https://github.com/base16-project/home/blob/main/builder.md#schemes-repository).
          190|     scheme:
             |     ^
          191|     let

       … from call site

         at /nix/store/c4ri83y4ka8q5ad1i9b278vp2qch2xx1-source/default.nix:237:25:

          236|
          237|       populatedColors = colors inputAttrs;
             |                         ^
          238|

       … while calling 'colors'

         at /nix/store/c4ri83y4ka8q5ad1i9b278vp2qch2xx1-source/default.nix:44:12:

           43|   */
           44|   colors = scheme:
             |            ^
           45|     let

       … from call site

         at /nix/store/c4ri83y4ka8q5ad1i9b278vp2qch2xx1-source/default.nix:76:18:

           75|
           76|       base-hex = lib.mapAttrs' (k: v: lib.nameValuePair "${k}-hex" v) base;
             |                  ^
           77|       base-short = lib.mapAttrs' (k: v: lib.nameValuePair "${k}" v) base;

       … while calling 'mapAttrs''

         at /nix/store/38rzi6kzh5ilbpdgpvd8aj34vksgkcfa-source/lib/attrsets.nix:518:5:

          517|     # Attribute set to map over.
          518|     set:
             |     ^
          519|     listToAttrs (map (attr: f attr set.${attr}) (attrNames set));

       … from call site

         at /nix/store/c4ri83y4ka8q5ad1i9b278vp2qch2xx1-source/default.nix:50:9:

           49|       base = lib.mapAttrs (_: value: lib.toLower (lib.removePrefix "#" value)) (
           50|         lib.filterAttrs (name: _: lib.hasPrefix "base" name && builtins.stringLength name == 6) scheme
             |         ^
           51|       );

       … while calling 'filterAttrs'

         at /nix/store/38rzi6kzh5ilbpdgpvd8aj34vksgkcfa-source/lib/attrsets.nix:305:5:

          304|     # The attribute set to filter
          305|     set:
             |     ^
          306|     listToAttrs (concatMap (name: let v = set.${name}; in if pred name v then [(nameValuePair name v)] else []) (attrNames set));

       … from call site

         at /nix/store/c4ri83y4ka8q5ad1i9b278vp2qch2xx1-source/default.nix:202:12:

          201|           //
          202|           (yaml2attrs scheme)
             |            ^
          203|         ;

       … while calling 'yaml2attrs'

         at /nix/store/c4ri83y4ka8q5ad1i9b278vp2qch2xx1-source/default.nix:108:16:

          107|
          108|   yaml2attrs = yaml:
             |                ^
          109|     builtins.fromJSON (builtins.readFile (pkgs.stdenv.mkDerivation {

       error: a 'x86_64-linux' with features {} is required to build '/nix/store/lm95hkshyfvyisjcxs17z4kx5mrcc3md-fromYAML.drv', but I am a 'aarch64-darwin' with features {benchmark, big-parallel, nixos-test}
7.63s user 1.97s system 51% cpu 18.808s total

[SenchoPens]

Hi Chris,

Thank you for submitting this interesting and important issue!
I am grateful for your clear explanation of the root cause.
I reproduced the bug and I see multiple possible solutions. I will try to implement a fix today.

[SenchoPens]

Hi Chris @montchr, can you please check whether the last release works for you? Once you confirm this, I'll make a PR to the Stylix repository to update the base16.nix input.

[montchr]

@SenchoPens Thanks for the update. Unfortunately the pure-Nix approach doesn't work for me, at least on aarch64-darwin:

error:
       … while checking flake output 'nixosConfigurations'

         at «none»:0: (source not available)

       … while checking the NixOS configuration 'nixosConfigurations.freundix'

         at «none»:0: (source not available)

       … while calling the 'seq' builtin

         at /nix/store/38rzi6kzh5ilbpdgpvd8aj34vksgkcfa-source/lib/modules.nix:326:18:

          325|         options = checked options;
          326|         config = checked (removeAttrs config [ "_module" ]);
             |                  ^
          327|         _module = checked (config._module);

       … while evaluating a branch condition

         at /nix/store/38rzi6kzh5ilbpdgpvd8aj34vksgkcfa-source/lib/modules.nix:267:9:

          266|       checkUnmatched =
          267|         if config._module.check && config._module.freeformType == null && merged.unmatchedDefns != [] then
             |         ^
          268|           let

       … in the right operand of the AND (&&) operator

         at /nix/store/38rzi6kzh5ilbpdgpvd8aj34vksgkcfa-source/lib/modules.nix:267:72:

          266|       checkUnmatched =
          267|         if config._module.check && config._module.freeformType == null && merged.unmatchedDefns != [] then
             |                                                                        ^
          268|           let

       … while evaluating the attribute 'unmatchedDefns'

         at /nix/store/38rzi6kzh5ilbpdgpvd8aj34vksgkcfa-source/lib/modules.nix:671:7:

          670|       # Transforms unmatchedDefnsByName into a list of definitions
          671|       unmatchedDefns =
             |       ^
          672|         if configs == []

       … while calling the 'concatLists' builtin

         at /nix/store/38rzi6kzh5ilbpdgpvd8aj34vksgkcfa-source/lib/modules.nix:678:11:

          677|         else
          678|           concatLists (mapAttrsToList (name: defs:
             |           ^
          679|             map (def: def // {

       … while calling anonymous lambda

         at /nix/store/38rzi6kzh5ilbpdgpvd8aj34vksgkcfa-source/lib/attrsets.nix:539:10:

          538|     attrs:
          539|     map (name: f name attrs.${name}) (attrNames attrs);
             |          ^
          540|

       … from call site

         at /nix/store/38rzi6kzh5ilbpdgpvd8aj34vksgkcfa-source/lib/attrsets.nix:539:16:

          538|     attrs:
          539|     map (name: f name attrs.${name}) (attrNames attrs);
             |                ^
          540|

       … while calling anonymous lambda

         at /nix/store/38rzi6kzh5ilbpdgpvd8aj34vksgkcfa-source/lib/modules.nix:678:46:

          677|         else
          678|           concatLists (mapAttrsToList (name: defs:
             |                                              ^
          679|             map (def: def // {

       … while calling anonymous lambda

         at /nix/store/38rzi6kzh5ilbpdgpvd8aj34vksgkcfa-source/lib/modules.nix:664:22:

          663|         # Propagate all unmatched definitions from nested option sets
          664|         mapAttrs (n: v: v.unmatchedDefns) resultsByName
             |                      ^
          665|         # Plus the definitions for the current prefix that don't have a matching option

       … while calling anonymous lambda

         at /nix/store/38rzi6kzh5ilbpdgpvd8aj34vksgkcfa-source/lib/attrsets.nix:539:10:

          538|     attrs:
          539|     map (name: f name attrs.${name}) (attrNames attrs);
             |          ^
          540|

       … from call site

         at /nix/store/38rzi6kzh5ilbpdgpvd8aj34vksgkcfa-source/lib/attrsets.nix:539:16:

          538|     attrs:
          539|     map (name: f name attrs.${name}) (attrNames attrs);
             |                ^
          540|

       … while calling anonymous lambda

         at /nix/store/38rzi6kzh5ilbpdgpvd8aj34vksgkcfa-source/lib/modules.nix:678:46:

          677|         else
          678|           concatLists (mapAttrsToList (name: defs:
             |                                              ^
          679|             map (def: def // {

       … while calling anonymous lambda

         at /nix/store/38rzi6kzh5ilbpdgpvd8aj34vksgkcfa-source/lib/modules.nix:664:22:

          663|         # Propagate all unmatched definitions from nested option sets
          664|         mapAttrs (n: v: v.unmatchedDefns) resultsByName
             |                      ^
          665|         # Plus the definitions for the current prefix that don't have a matching option

       … while calling anonymous lambda

         at /nix/store/38rzi6kzh5ilbpdgpvd8aj34vksgkcfa-source/lib/modules.nix:594:46:

          593|       # an attrset 'name' => list of submodules that define ‘name’.
          594|       defnsByName = byName "config" (module: value:
             |                                              ^
          595|           map (config: { inherit (module) file; inherit config; }) (pushDownProperties value)

       … from call site

         at /nix/store/38rzi6kzh5ilbpdgpvd8aj34vksgkcfa-source/lib/modules.nix:595:69:

          594|       defnsByName = byName "config" (module: value:
          595|           map (config: { inherit (module) file; inherit config; }) (pushDownProperties value)
             |                                                                     ^
          596|         ) configs;

       … while calling 'pushDownProperties'

         at /nix/store/38rzi6kzh5ilbpdgpvd8aj34vksgkcfa-source/lib/modules.nix:826:24:

          825|   */
          826|   pushDownProperties = cfg:
             |                        ^
          827|     if cfg._type or "" == "merge" then

       … from call site

         at /nix/store/fxgkj2xxcz9pn5khyq9f0ddyfpiw854y-source/stylix/palette.nix:128:26:

          127|     # https://github.com/SenchoPens/base16.nix#mktheme
          128|     lib.stylix.colors = (base16.mkSchemeAttrs cfg.base16Scheme).override override;
             |                          ^
          129|     lib.stylix.scheme = base16.mkSchemeAttrs cfg.base16Scheme;

       … while calling 'mkSchemeAttrs'

         at /nix/store/4wg7s6z4hmv6x7a8nzr6nznd1mz0x5cw-source/default.nix:235:5:

          234|     # (see https://github.com/base16-project/home/blob/main/builder.md#schemes-repository).
          235|     scheme:
             |     ^
          236|     let

       … from call site

         at /nix/store/4wg7s6z4hmv6x7a8nzr6nznd1mz0x5cw-source/default.nix:279:25:

          278|
          279|       populatedColors = colors inputAttrs;
             |                         ^
          280|

       … while calling 'colors'

         at /nix/store/4wg7s6z4hmv6x7a8nzr6nznd1mz0x5cw-source/default.nix:45:12:

           44|   */
           45|   colors = scheme:
             |            ^
           46|     let

       … from call site

         at /nix/store/4wg7s6z4hmv6x7a8nzr6nznd1mz0x5cw-source/default.nix:77:18:

           76|
           77|       base-hex = lib.mapAttrs' (k: v: lib.nameValuePair "${k}-hex" v) base;
             |                  ^
           78|       base-short = lib.mapAttrs' (k: v: lib.nameValuePair "${k}" v) base;

       … while calling 'mapAttrs''

         at /nix/store/38rzi6kzh5ilbpdgpvd8aj34vksgkcfa-source/lib/attrsets.nix:518:5:

          517|     # Attribute set to map over.
          518|     set:
             |     ^
          519|     listToAttrs (map (attr: f attr set.${attr}) (attrNames set));

       … from call site

         at /nix/store/4wg7s6z4hmv6x7a8nzr6nznd1mz0x5cw-source/default.nix:51:9:

           50|       base = lib.mapAttrs (_: value: lib.toLower (lib.removePrefix "#" value)) (
           51|         lib.filterAttrs (name: _: lib.hasPrefix "base" name && builtins.stringLength name == 6) scheme
             |         ^
           52|       );

       … while calling 'filterAttrs'

         at /nix/store/38rzi6kzh5ilbpdgpvd8aj34vksgkcfa-source/lib/attrsets.nix:305:5:

          304|     # The attribute set to filter
          305|     set:
             |     ^
          306|     listToAttrs (concatMap (name: let v = set.${name}; in if pred name v then [(nameValuePair name v)] else []) (attrNames set));

       … from call site

         at /nix/store/4wg7s6z4hmv6x7a8nzr6nznd1mz0x5cw-source/default.nix:245:20:

          244|                   builtins.unsafeDiscardStringContext "${scheme}"
          245|           )); } // yaml2attrs scheme;
             |                    ^
          246|

       … while calling 'yaml2attrs'

         at /nix/store/4wg7s6z4hmv6x7a8nzr6nznd1mz0x5cw-source/default.nix:115:16:

          114|   yaml2attrs-ifd = yaml: builtins.fromJSON (builtins.readFile (yaml2json yaml));
          115|   yaml2attrs = yaml: import "${fromYaml}/fromYaml.nix" { inherit lib; } (builtins.readFile yaml);
             |                ^
          116|   # Checks that the above yaml2attrs function has correctly parsed an yaml file.

       … from call site

         at /nix/store/4wg7s6z4hmv6x7a8nzr6nznd1mz0x5cw-source/default.nix:115:22:

          114|   yaml2attrs-ifd = yaml: builtins.fromJSON (builtins.readFile (yaml2json yaml));
          115|   yaml2attrs = yaml: import "${fromYaml}/fromYaml.nix" { inherit lib; } (builtins.readFile yaml);
             |                      ^
          116|   # Checks that the above yaml2attrs function has correctly parsed an yaml file.

       … while calling 'parse'

         at /nix/store/lzvgfxcp5kjwgs66l8dfqvbqcy47gla4-source/fromYaml.nix:29:11:

           28|
           29|   parse = text: let
             |           ^
           30|     lines = l.splitString "\n" text;

       … from call site

         at /nix/store/lzvgfxcp5kjwgs66l8dfqvbqcy47gla4-source/fromYaml.nix:177:5:

          176|   in
          177|     make filtered (-1);
             |     ^
          178| in

       … while calling 'make'

         at /nix/store/lzvgfxcp5kjwgs66l8dfqvbqcy47gla4-source/fromYaml.nix:103:19:

          102|     */
          103|     make = lines: i: let
             |                   ^
          104|       mNext = l.elemAt matched (i + 1);

       … from call site

         at /nix/store/lzvgfxcp5kjwgs66l8dfqvbqcy47gla4-source/fromYaml.nix:138:9:

          137|       childrenMerged =
          138|         l.foldl
             |         ^
          139|         (all: cObj: (

       … while calling 'foldl'

         at /nix/store/38rzi6kzh5ilbpdgpvd8aj34vksgkcfa-source/lib/lists.nix:81:20:

           80|   */
           81|   foldl = op: nul: list:
             |                    ^
           82|     let

       … from call site

         at /nix/store/38rzi6kzh5ilbpdgpvd8aj34vksgkcfa-source/lib/lists.nix:87:8:

           86|         else op (foldl' (n - 1)) (elemAt list n);
           87|     in foldl' (length list - 1);
             |        ^
           88|

       … while calling 'foldl''

         at /nix/store/38rzi6kzh5ilbpdgpvd8aj34vksgkcfa-source/lib/lists.nix:83:16:

           82|     let
           83|       foldl' = n:
             |                ^
           84|         if n == -1

       … from call site

         at /nix/store/38rzi6kzh5ilbpdgpvd8aj34vksgkcfa-source/lib/lists.nix:86:14:

           85|         then nul
           86|         else op (foldl' (n - 1)) (elemAt list n);
             |              ^
           87|     in foldl' (length list - 1);

       … while calling anonymous lambda

         at /nix/store/lzvgfxcp5kjwgs66l8dfqvbqcy47gla4-source/fromYaml.nix:139:15:

          138|         l.foldl
          139|         (all: cObj: (
             |               ^
          140|           if l.isAttrs cObj

       … while calling anonymous lambda

         at /nix/store/lzvgfxcp5kjwgs66l8dfqvbqcy47gla4-source/fromYaml.nix:134:10:

          133|         l.map
          134|         (sIdx: make lines sIdx)
             |          ^
          135|         childIdxs;

       … from call site

         at /nix/store/lzvgfxcp5kjwgs66l8dfqvbqcy47gla4-source/fromYaml.nix:134:16:

          133|         l.map
          134|         (sIdx: make lines sIdx)
             |                ^
          135|         childIdxs;

       … while calling 'make'

         at /nix/store/lzvgfxcp5kjwgs66l8dfqvbqcy47gla4-source/fromYaml.nix:103:19:

          102|     */
          103|     make = lines: i: let
             |                   ^
          104|       mNext = l.elemAt matched (i + 1);

       … from call site

         at /nix/store/lzvgfxcp5kjwgs66l8dfqvbqcy47gla4-source/fromYaml.nix:78:17:

           77|         key = l.elemAt m1 1;
           78|         value = parseValue (l.elemAt m1 2);
             |                 ^
           79|       }

       … while calling 'parseValue'

         at /nix/store/lzvgfxcp5kjwgs66l8dfqvbqcy47gla4-source/fromYaml.nix:16:16:

           15|
           16|   parseValue = value: let
             |                ^
           17|     is = re: l.match re value != null;

       … from call site

         at /nix/store/lzvgfxcp5kjwgs66l8dfqvbqcy47gla4-source/fromYaml.nix:22:8:

           21|   in
           22|     if is singlueQuotedString then
             |        ^
           23|       contentOf singlueQuotedString

       … while calling 'is'

         at /nix/store/lzvgfxcp5kjwgs66l8dfqvbqcy47gla4-source/fromYaml.nix:17:10:

           16|   parseValue = value: let
           17|     is = re: l.match re value != null;
             |          ^
           18|     contentOf = re: l.elemAt (l.match re value) 0;

       error: invalid regular expression ''(.*?)'[[:space:]]*'

       at «none»:0: (source not available)

I actually tried something like that yesterday on aarch64-darwin and got the same (or nearly-identical) error.

I've also used https://github.com/Misterio77/nix-colors, which uses a pure-Nix approach to YAML parsing, and that has no issues for me on this machine. However, I reported a similar regex issue there almost a year ago and it has since been fixed:

• darwin: invalid regular expression in schemeFromYAML.nix Misterio77/nix-colors#17
• Fix darwin incompatibility caused by regex use Misterio77/nix-colors#20

But it looks like the error I'm seeing on 2c292df is different:

error: invalid regular expression ''(.*?)'[[:space:]]*'

[SenchoPens]

Hi Chris, thanks for trying out the new version!
Seems like the update needs more work :)
Unfortunately I'm a little busy right now as it's the end of the semester, but I'll try to think of some robust fix this week. You can still opt-out of pure Nix parsing at the cost of doing an IFD, see the Troubleshooting section

[SenchoPens]

Hi @montchr, I might have fixed this issue in the latest release, can you please try it out?

[SenchoPens]

Closing due to innactivity. Please reopen if the issue is still there.