[.FuneraL.]

pawn Код:

CMD:goldrims(playerid)
{
    if(GetPlayerState(playerid) != PLAYER_STATE_DRIVER)) return SendClientMessage(playerid, 0xFFFFFFFF, "You are not driving a vehicle.");
    AddVehicleComponent(GetPlayerVehicleID(playerid),1080);
    SendClientMessage(playerid, 0xFFFFFFFF, "You have added Gold Rims to your vehicle.");
    return 1;
}

Not using params, remove the params[]