Problem with scripting monsters

[LulleBulle]

void OnStart()
{
AddEntityCollideCallback("Player", "ScriptArea_1", "ActivateMonster", true, 1);
}

void ActivateMonster(string &in asParent, string &in asChild, int alState)
{
SetEntityActive("servant_grunt_2", true);
}
i dont think you want the monster to appear when leaving the map?

That wasn't his error, he just had typos, he forgot the closing bracket in the monster function and also the () at OnLeave.