sclang REPL is not working with local supercollider

[lukaprincic]

I'm trying to run a sclang repl and can't figure out what is happening. it seems like the REPL in console is not able to start the server (scsynth)?

I'm on Linux, running SC in both Emacs or SC IDE successfuly.
SuperCollider 3.12.2

steps to reproduce:

jack is running

i choose sclang in https://flok.cc/s/muddy-rose-zebra-9eee667b

i click on REPL on right side and get the code to run in terminal:

npx flok-repl@latest -H wss://flok.cc \
  -s muddy-rose-zebra-9eee667b \
  -t sclang \
  -T user:LU

I run that in terminal:

$ npx flok-repl@latest -H wss://flok.cc \
  -s muddy-rose-zebra-9eee667b \
  -t sclang \
  -T user:LU
Hub address: wss://flok.cc
Session name: muddy-rose-zebra-9eee667b
Types: [ 'sclang' ]
> SC FFT global init: cosTable initialised.
compiling class library...
> 	Found 867 primitives.
	Compiling directory '/usr/local/share/SuperCollider/SCClassLibrary'
	Compiling directory '/usr/local/share/SuperCollider/Extensions'
	Compiling directory '/home/random/.local/share/SuperCollider/Extensions'
	Compiling directory '/home/random/.local/share/SuperCollider/downloaded-quarks/LinuxExternal'
	Compiling directory '/home/random/.local/share/SuperCollider/downloaded-quarks/linuxutils-quark'
	Compiling directory '/home/random/.local/share/SuperCollider/downloaded-quarks/JACK'
	numentries = 1325460 / 20237376 = 0.065
	5802 method selectors, 3488 classes
	method table size 21516152 bytes, big table size 161899008
	Number of Symbols 15324
	Byte Code Size 447975
	compiled 606 files in 0.46 seconds

Info: 6 methods are currently overwritten by extensions. To see which, execute:
MethodOverride.printAll

compile done
> localhost : setting clientID to 0.
> internal : setting clientID to 0.
> Class tree inited in 0.01 seconds
> JACK quark is attempting to contact the Jack server
> 

*** Welcome to SuperCollider 3.12.2. *** For help type ctrl-c ctrl-h (Emacs) or :SChelp (vim) or ctrl-U (sced/gedit).

There is no scsynth in jack (qjackctl) for example...

I run the code in flok, something like play { WhiteNoise.ar!2 * 0.1 }. It appears in the terminal window:

...
> JACK quark is attempting to contact the Jack server
> 

*** Welcome to SuperCollider 3.12.2. *** For help type ctrl-c ctrl-h (Emacs) or :SChelp (vim) or ctrl-U (sced/gedit).
< play{WhiteNoise.ar!2}

and nothing else happens.