Help with using ACID on a DOOR

[Cetex1337]

So i'm trying to make a script where some acid from the inventory should break a door. The script so far looks like this:

PHP Code: (Select All)

void OnStart(){ AddUseItemCallback("", "acid", "acid_door", aciddoor, true);}
void aciddoor(string &in asItem, string &in asEntity){SetPropHealth("acid_door", 0.0f);} 


But it wont let me do that, it says that its some wrong signature or something. I have checked everything, but i don't understand.