I set up an arclight server with some mods and plugins and it kept crashing, i tried to remove radium but the same errors appeared.
Crash log: https://mclo.gs/jO7K1Iz
Of the newer versions I have tested, 1.21.5 does work perfectly fine, but the only others I have tried, being 1.12.2 and now 1.16.5 with the mods you suggested showing the same results of crashing with exit code 6.
Several client crashes tied to goblin_goo:
"Unable to load item model 'goblinmod:item/goblin_goo'".
"Referenced from: goblinmod:item/goblin_goo#inventory".
Verified correct file paths (.json and .png), with underscore usage consistent across files.
Files appeared valid, and paths aligned with expectations.
FMLJavaModLoadingContext.get() marked for removal, triggering a warning.
Not currently fatal, but might become an issue in future Forge versions.
https://www.mediafire.com/folder/4uh6ytqre4az2/Goblinmod
full project files linked