Script Error! Help!

[FreshKorruption]

Hi can someone help me? I am scripting a custom mod for amnesia and i keep getting thease error messeges..
HELP!



void OnStart()
{
SetEntityPlayerInteractCallback("key_study_1", "Activate_monster", "True");
}

void OnEnter()
{

}
void Activate_monster(string &in Entity)
{

SetEntityActive("servant_grunt_1", "True");
AddEnemyPatrolNode("servant_grunt_1", "PathNodeArea_1", 0, "idle");
AddEnemyPatrolNode("servant_grunt_1", "PathNodeArea_2", 0, "idle");

}


It says: No Matching signatures :/

Try taking the _ out of the Activate_monster. Do this for every time it says that is listed.