Error while compiling a @Shadow field (Mixin)

Hi! I’m having an error while I compile my plugin. The error is related to the @Shadow annotation.
It seems it’s trying to obfiscate the annotation. Can you tell me what I’m doing wrong please?

Sponge Build: 1.12.1-7.0.0-BETA-321 (Mixin 0.7.2)
Java Version: Java 8
Compile Log:

Plugin Source: package com.degoos.wetsponge.mixin;import com.degoos.wetsponge.util.Internal -

You have a shadow field called worldObj but you’re using a mapping set when that field is named world.

It seems I was using a old mapping. Thanks!