Script help

[Rakez68]

Hello.

I need help with one script. I have 4 chemicals in a map and after picking up all the four chemicals to your inventory, you can use them on a chemistry pot which is on a table. After that, you'll be able to pick it up to your inventory and later use it.

My current script looks like this:
void OnStart()
{
for("int i=0;i<=4;i+") AddUseItemCallback("Chem"+i, "GetAcidComplete", "UsedChemsOnPot", true, 0);
}
void UsedChemsOnPot(string &in asItem, string &in asEntity)
{
{
if("asParent" == "Chem1" && GetLocalVarInt("Var1") == 1)
{
SetLocalVarInt("Var1", 1);
}
else if("asParent" == "Chem2" && GetLocalVarInt("Var1") == 1)
{
SetLocalVarInt("Var1", 1);
}
else if("asParent" == "Chem3" && GetLocalVarInt("Var1") == 1)
{
SetLocalVarInt("Var1", 1);
}
else if("asParent" == "Chem4" && GetLocalVarInt("Var1") == 1)
{
SetLocalVarInt("Var1", 1);
}
}
if(GetLocalVarInt("Var1") == 4)
{
PlayMusic("26_event_agrippa_head.ogg", false, 0.7, 0.1, 10, false);
}
}

It gives me this error right now:

FATAL ERROR: Could not load script file 'custom_stories/His dearest friend/Maps/WineCellar.hps'!
main (16, 23) : ERR :Expected ';'

And if i remove the " from ("int i=0;i<=4;i+"), it gives me this error:

FATAL ERROR: Could not load script file 'custom_stories/His dearest friend/Maps/WineCellar.hps'!
main (15, 23) : ERR : Expected ';'

It doesn't make sense..

Would really appreciate if you'd tell me is the script itself even right, and if it is, what's the problem?