Aristois

If it still doesn't work, try to additionally do the steps @Dyiing suggested.

@dekel I had the same issue and I tried the solution @Dyiing suggested. But it didn't work. But I found the solution. What you have to do is to go to

.minecraft\.fabric\processedMods\

and delete all files that contain the word "seedfinding" in it. After deleting, you can launch fabric with the mod installed, and it won't crash anymore.

Hope this helps!