unexpected token {

[Combustible Lemon]

void OnStart()
{
AddUseItemCallback("", "key_1", "prison_1", "KeyOnDoor", true);
AddUseItemCallback("", "key_tomb_rusty_1", "mansion_3", "KeyOnDoor2", true);
}

void KeyOnDoor(string &in asItem, string &in asEntity)
{
SetSwingDoorLocked("prison_1", false, true);
PlaySoundAtEntity("", "unlock_door.snt", "prison_1", 0.0f, true);
RemoveItem("key_1");
}

void KeyOnDoor2(string &in asItem, string &in asEntity)
{
SetSwingDoorLocked("mansion_3", false, true);
PlaySoundAtEntity("", "unlock_door.snt", "mansion_3", 0.0f, true);
RemoveItem("rusty_1");
}

{
AddEntityCollideCallback("Player" , "ScriptArea_1" , "MonsterFunc1" , true , 1);
}
void MonsterFunc1(string &in asParent , string &in asChild , int alState)
{
SetEntityActive("servant_grunt" , true);
}
It says unexpected token { and i can't find out what to do. Im new at scripting.