My Server Needs Help

[Supermohamedkf]

I Joined My Server And Suddenly It Kicked me and Typed a Msg I Tried Joining Again And it Kicked me again for this reason

Internal Exception: io.netty.handler.codec.EncoderException: java.lang.NoSuchFieldError: Class com.viaversion.viabackwards.api.data.BackwardsMappingData does not have member field 'com.viaversion.viaversion.api.data.Mappings attributeMappings'

[Pryzmm]

16 minutes ago, Supermohamedkf said:

I Joined My Server And Suddenly It Kicked me and Typed a Msg I Tried Joining Again And it Kicked me again for this reason

Internal Exception: io.netty.handler.codec.EncoderException: java.lang.NoSuchFieldError: Class com.viaversion.viabackwards.api.data.BackwardsMappingData does not have member field 'com.viaversion.viaversion.api.data.Mappings attributeMappings'

try removing ViaBackwards or updating it to the latest version