so when I press /set air it says java.lang.ExceptionInInitializerError:Null and it says that report this bug, and there is more information in the console at ...

I have tried both V5.1.0 and the latest DEV build v5.1.1-SNAPSHOT-669 This is running on a hybrid forge/bukkit server (magma) and Protocollib was working a couple of months ago before I updated it, I ...