Lightmap baking

[Rexsurry]

Hey everyone! My head is exploding when it comes to Lightmap baking.

I´ve made a big Scene with a lot of PBR textures. Then I baked the light into an Image. When I try to export it to Hubs an Error from spokes appears: Error uploading file: "Error loading glTF "blob:https://hubs.mozilla.com/94b9bc48-aaf9-46e6-b6b6-22c20f7a4fe9": Cause: Cannot read properties of undefined (reading 'uri')"

I did another Scene 1 Month ago with an older Blender Version but with the same properties and there it works. I already tried shading there with just the background node and one image.

I'm new here, I hope I am in the right section for this question