I think Anvar1061 has solved this problem, thank a million
I seem to have made some kind of mistake in packing my mod and the folder path is wrong
I'll make a new archive package of my mod with a correct folder structure and hopefully JSGME works as it should after that. I believe I'll have time to upload the corrected mod package tonight.
If not or you don't want to waste time waiting or downloading, just unpack the mod and change the folder path yourselves:
The tga files are now in a folder Charts addon/data/gui/layout
The tga files should be in a folder Charts addon/data/menu/gui/layout
1. Unpack the archive
2. Open folder Charts addon/data
3. Add a new folder and name it menu
4. Cut folder gui
5. Go to folder menu
6. Paste folder gui
After that it should work through JSGME.
I'll post again after having uploaded a corrected version of my mod.