I need help with Trigger enemies

[eg15ncvfxa]

I have a mac and i put in the code but when i try to play the map it says error.


{
SetEntityCallbackFunc("Monster_1", "OnPickup");
}
void OnPickup(string &in asEntity, string &in type)
{
SetEntityActive("Monster_1", true);
ShowEnemyPlayerPosition("Monster_1");
}