[SCRIPT] ERR: Expected data type

[vabalas]

Every time I try to open my custom map, it says ...main (20,15) : ERR : Expected data type. I tried to solve it myself, but couldn't.
here's the script:

// This runs when the map first starts
void OnStart()
{
AddEntityCollideCallback("Player", "end", "ending", true, 1);
GiveItemFromFile("lantern_" + I, "lantern");
}

//===========================================
// This runs when the player enters the map
void OnEnter()
{
}

//===========================================
// This runs when the player leaves the map
void OnLeave()
{
}

void ending("Player", "end", 1)
{
StartCredits("themonsterswithin.ogg", false, "Ending", "MainCredits", 0);
FadeOut(float 1);
}

Any help?