Forge version: 14.23.5.2860
Mixinbooter: mixinbooter-4.2
Multiblocked: multiblocked-0.4.0 (file ID: 3758247) (the most recent one, happens with id: 3757892 too)

When trying to launch the game, forge detects a duplicate instance of the mod, crashing the game.

Log:
latest.log

Screenshot:

Similar bug report: gorilla-devs/GDLauncher#1279 , seems to only occur (randomly) with players using GDLauncher.

FionaTheMortal/better-biome-blend#30

Same issue here. They managed to fix it. Might be worth looking into.

Thanks, just taken a look but doesn't really help much. Do you have a debug.log? It'd offer more information.

I cant find a debug.log file, but I have a log of the GDlauncher console

log.txt

This should be fixed in one of the recent releases. Closing it for now.