I'm not sure why I'm having this issue since I don't see any other issues like it on github. Using prism launcher, fresh install of 1.21.1. Only installing immersive portals with fabric. When creating a single player world I get the error "invalid player data"

I've tried deleting and making new instances of minecraft and it didn't help

error logs.txt

I closed this for a sec cause I realized I hadn't updated prism launcher. But after updating the issue persists. I've attached a log of what happens when I try to enter a world if it helps

I was also running a fresh instance, etc. Downgraded to the last version of Fabric API to resolve (Fabric API 0.107.0+)

I also have the same issue. Using Modrinth and the Fabric API. Happens even a fresh instance of MC 1.21.1 and Immersive Portals 6.0.4 on both old (on other instances) and new worlds.

Did you downgrade Fabric API as described above? For me it was a Fabric issue, not an Immersive Portals issue.

Did you downgrade Fabric API as described above? For me it was a Fabric issue, not an Immersive Portals issue.

Okay I swear I'm not an idiot I just didn't see the "to resolve" part of your comment and my brain kinda just skipped over it. It works now...

No judgement. My brain skips texts constantly :) Glad you're up and running!