Jean, just FYI that is the only error. If you don't import "pmtCreatePrefabPool.cs," no other problems appear to arise. I don't know how to fix the action bug, but creating pools manually is pretty easy... if you recently bought Pool Manager like me, don't be afraid to dive in.
EDIT: If I may add a humble request, please add "Use Owner" as an option to the "Pmt De Spawn" action for GameObject. This would make it a drop-in replacement for "Destroy Self."