[JaTochNietDan]

He made a comment in your code where an issue is, here:

pawn Код:

SetPVarInt(killerid ,"killstreak", GetPVarInt(killerid, "var") + 1); //var should be  killstreak, there is the error

It should be

pawn Код:

SetPVarInt(killerid ,"killstreak", GetPVarInt(killerid, "killstreak") + 1);

Although the problem is caused by the fact your script does not contain main()

pawn Код:

main()
{

}