Minecraft version(s)

Other (specify below)

Minecraft version details

1.18

Mod loader

Fabric

Mod loader version

fabric 0.10.1

Fabric API version

Fabric 0.44.0

In what environment did the problem occur?

My multiplayer server that I was running

What went wrong? (Crash logs don't go here)

Linking a 1x3 and 2x6 portal leads to crashing upon entry into either portal. Immersive Portals version 1.0.1 and Pehkui version 3.0.1 for MC version 1.18. Single player leads to same outcome.

Full list of installed mods

immersive portals 1.0.1 for 1.18
Fabric api 0.44.0 for 1.18
pehkui 3.0.1 for 1.18

Did the problem cause the game to crash?

Yes. (paste crash report below)

Full crash report contents (if you experienced a crash)

The game crashed whilst exception in world tick
Error: java.lang.NoClassDefFoundError: net/minecraftforge/fml/config/IConfigSpec
Exit Code:
crash-2021-12-04_03.48.38-client.txt
-1