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Knight of the Abyss, if you have one, please share a script guide. The last parameter of triggers is the name of the function that should be called when the trigger is activated. To clear it, you need to insert nil instead of the name:
setting:
Trigger(REGION_ENTER_AND_STOP_TRIGGER,"reg_1","Question");
deleting:
Trigger(REGION_ENTER_AND_STOP_TRIGGER,"reg_1",nil);
A similar error exists in your first example with the message box.
setting:
Trigger(REGION_ENTER_AND_STOP_TRIGGER,"reg_1","Question");
deleting:
Trigger(REGION_ENTER_AND_STOP_TRIGGER,"reg_1",nil);
A similar error exists in your first example with the message box.