This message is in fact correct - there is indeed an invalid call in that event. ent_remove and ent_create should not be called directly in an event.
It doesn't harm in this case, but for getting rid of the warning, put a wait(1) at the begin of the event in line 532. The script will be fixed in the official release.
Also happens when removing light entity!
EDIT:Also where skycube is enabled and disabled.
Thanks.
