[Infin1ty]

Код:

CMD:kick(playerid, params[]) // params is a string.
{
       new id;

       // you missed an extra bracket after 'id'
       if(sscanf(params, "u", id))  return scm(playerid, COLOR_USAGE, "USAGE:/kick [id]");
       if(id == INVALID_PLAYER_ID) return scm(playerid, COLOR_ERROR, "invalid id");

       Kick(id);
       return 1;
}

The code you have just given us is perfectly fine. I've improved it where I've noticed a couple of issues.