nickname121341

I used LivingEquipmentChangeEvent and no errors were found in the code, but for some reason, when I put on the armor, minecraft crashes. code:

Hello, I'm new in modding and I wanted to make it so that when putting on armor, the effect of potions was given, but all the lessons are for older versions of Minecraft and they do not work on 1.15.1 Could you help me, thanks in advance. (I do not know English very well and therefore translated via Google Translate. Sorry If there are grammatical errors)