[SCRIPT] combination does not work?

[zombiehacker595]

so i added this to my inventory.hps file i have 3 working combinations all the same just different names in that file but this one doesnt seem to want to wrok any help?

//COMBINE TUBE//
////////////////////

void NEEDLE_TUBE(string &in asItemA, string &in asItemB)
{
PlayGuiSound("15_make_hammer", 1.0f);
RemoveItem(asItemA); RemoveItem(asItemB);
GiveItem("copper_tube_and_needle", "Puzzle", "copper_tube_and_needle", "copper_tube_and_needle.tga", 0);
}

////////////////////////////
// Run at the start of the game.
void OnGameStart()
{

/////NEEDLE & TUBE COMBO/////
AddCombineCallback("NEEDLE_TUBE", "copper_tube_1", "hollow_needle_1", "NEEDLE_TUBE", false);



}