Lever Problem

[Brothersvv09]

That didnt work :/ it said :
main ERR 4,6 can't be void
main ERR 4,44 only objects have constructors
Here is my script:
void OnStart()
{
AddUseItemCallback("", "key", "LockedDoor1", "UsedKeyOnDoor", true);
void SetEntityConnectionStateChangeCallback("Lever", UnlockDoor);
}

void UsedKeyOnDoor(string &in asItem, string &in asEntity)
{
SetSwingDoorLocked("LockedDoor1", false, true);
RemoveItem("key");
}

void UnlockDoor(string &in asEntity, int alState);
{
if (alState == 1)
{
SetEntityActive("LockedDoor2", true);
return;
}
}