I was able to play before using this modpack on this server, and now when reconnecting, I get an error;

Full logs: https://mclo.gs/1sIhZjT

[09:04:27] [Netty Client IO #0/ERROR]: Encountered exception while handling in channel with name "moonlight:1"
java.lang.UnsupportedOperationException: Failed to get registry access. This is a bug

Other people are able to play on the same server

I can probably grab my playerdata file, if that's possibly relevant

No idea how this could ever happen as it says it's caused by MC instance itself being null. Try giving other players a map and see if they can reproduce. Maybe it's an issue with another mod or quilt

Happens when a packet that update maps is sent and somehow it finds a client that has no Minecraft level set. Maybe it gets sent somehow before that happens idk how tho as player updates should happen after player is placed in world. Maybe try without map atlas

I know other people on the server have created maps.

I'm using the map atlas mod, could that be related?

The first time I saw this error I actually was connecting using a wrong version of the pack - could that possibly have corrupted my data? Seems unlikely but I'm not sure what to look for

If I erase my player data is that likely to help?

Removing my player .dat file did let me log in, so perhaps this is a bug with map atlas.

I'll try inspecting the file with NBTExplorer and see if I can repair it

I was able to delete the atlas from my equipment slots and that solved the crash, though I'm still not sure why it happened