Unexpected end of file?!? plz help..

[The chaser]

Hello everyone, i'm making a test map, just with one monster. By the moment i'm learning, but i need help, when i run "The chasing" appears a window saying:
FATAL ERROR: Could not load script file "custom_stories/The chasing/Maps/The chasing.hps"!
main (19, 14): ERR : Expected identifier

This is the script:

void OnStart()
{
AddEntityCollideCallback("Player", "ScriptArea_1", "ActivateMonster", true, 1);

}
void OnEnter ()

{

}

Void OnLeave ()
{

}

void ActivateMonster(string &in asParent, string &in asChild, int alState);

SetNPCActive("Main", true);

Before i used to put a "}" in the final, but it said "unexpected end of file". I tried to see the syntaxis error, but i couldn't find it. I would like a lot a bit of help, i've been stuck in here for a long time.