2 Script error

[Hellday]

Hello, first sorry for my bad english, i'm French.
I've a problem with my script, one is for a locked door and key, the other spawn a monster. They work perfectly but when I put them both in my .hps i've a fatal error.

void OnStart()
{

SetEntityPlayerInteractCallback("lantern_1", "Spawn_Monster", true);

}

void Spawn_Monster(string &in entity)
{

SetEntityActive("servant_grunt_1", true);
}

void UseKey(string &in asItem, string &in asEntity)
{
SetSwingDoorLocked(asEntity, false, true);

RemoveItem(asItem);
}


void OnStart()
{

AddUseItemCallback("useexit", "key_1", "coffre", "UseKey",true);

Thanks for reply.