Fatal error problems

[Zlynan]

Hello, when i'm tring to start my own custom story i made with HPL editor it says:

FATAR ERROR: Could not load script file 'custom_stories/First map/maps/Firstmaps.hps'!
main (12,16) : ERR : 'monsterdoorkey_1' is not declared.

And this is my script:

////////////////////////////
// Run when entering map
void OnEnter()
{
AddUseItemCallback("", "monsterdoorkey_1", "doorone", "UsedKeyOnDoor", true);
}

void MyFunc(string &in asItem, string &in asEntity)
{
SetSwingDoorLocked("doorone", false, true);
PlaySoundAtEntity("", "unlock_door", "doorone", 0, false);
RemoveItem(monsterdoorkey_1);
}

////////////////////////////
// Run when leaving map
void OnLeave()
{

}

Please help me!