I have the same problem here! After installing GameDraw it is no proper way to uninstall it. And I have the same error "The referenced script on this Behaviour is missing!", when I'm double click it shows "GameDrawManager" prefab a fantom object, that cannot be founded nowhere! All this stuff is seems to conflict with our build and crashing randomly when loading game level. PLEASE FIX IT  !A S A P! It's really ruing our work here(((