Errors at Console

Hi, I'm getting errors like this at console, can you help me?
https://mclo.gs/7doDwsw

Paper 1.21 build #130
Itemsadder 4.0.2-alpha-test-3
LoneLibs 1.0.58
Protocollib #726

Did you try to use very latest IA build?

4.0.2-beta-release-10

Let me know if it helps