OK, so I have modified the advanced kits plugin, credit to the author, Luca28pet I receive this error when I try and use a kit: Server thread/CRITICAL Error: "Call to undefined method pocketmine\inventory\PlayerInventory::setHelmet()" (EXCEPTION) in "AdvancedKits.phar/src/AdvancedKits/Kit" at line 79 I'll attach the plugin: I would be so grateful is someone could tell me what is going wrong here