You should not reimport any libraries existent in your map. So like, if TimerUtils is there, delete one. You say deleting all duplicates still causes errors, but that's the best I could think of (logically it should solve your problem). You're going to have to go super specific if that doesn't work
All the spells had multi level support as far as I remeber (although I may not have demonstrated it in use). Additionally there were some bugs resulting in incorrect damage nulling and what I did with destroying triggers was deemed unsafe and leaky. Sure you can still use them but be aware that although they are a lot better than GUI equivelents, they still have flaws.