Using it on 1.18.1 Fabric latest version.

When I load a save file or create a new one it says there's an error in datapacks and it lets me choose between safe mode (which doesn't do anything) and return to the main menu. I went back and downgraded my recently updated mods and figured out it was related to collective 4.0, but I don't have the knowledge/time to give more details.

Had to downgrade to 3.2 to play.

Thanks for opening the issue so quickly. Could you test Collective version 4.1? It should fix the problem you were having.

https://www.curseforge.com/minecraft/mc-mods/collective-fabric/files/all

Collective version 4.1 worked perfectly for me, no more issues. I really appreciate all the quality mods you're providing the community with, cheers!

Thanks for confirming and the kind words! Glad they're of some use to you. :)