game crashed whilst exception in server tick loop Error

[Alreet]

Juststarted trying to run mods on Minecraft, installed Forge and the mods I wanted okay but now when I run hte game I'm getting this error, any ideas on how to fix?

 

 The game crashed whilst exception in server tick loop Error: java.lang.NoClassDefFoundError: Could not initialize class com.crowsofwar.avatar.common.util.AvatarUtils

[Alreet]

attached thanks

crash-2020-06-06_12.41.05-server.txt