The name of the error is "Mouse click event"
It immediately crashes the game when you try to make a new world.

You didn't provide a crash log, and I am unable to reproduce it.
There is a known issue of MC crashing when you have datapacks that are broken/invalid.
This is a side effect of how the mod forcing those datapacks active, and there is no way to fix this.
(MC cannot just disable those when there is an error and continue loading)