Heey, I am currently working on making my own pixelmon server (pixelmon 1.12.2 - 7.0.5) but when I try to use shopkeepers I get instantly kick out the server with the text ''Internal server error''. Also when I try fighting pokemons or NPC's the server crashed somewhere mid battle. can someone please help me with this? I've been trying to find the solution online but can't find it.
This is the btw the crash report: