Ok, so, I can't play with forge 1.14 & 1.15 and it's gaves me an error.
I know that is not about mods because if I play without mods the error comes again someone can answer how I can play in 1.14 & 1.15?
I found the problem!
Looking better at the villagerTrades and comparing with your suggestion, i notice that i forgot to add @subscribeEvent at the method.
So, basically, every new kind of event that i create, i must use @subscribeEvent for Forge recognizes then, right?