[RajatPawar]

pawn Код:

public OnPlayerKeyStateChange(playerid, newkeys, oldkeys)
{
    new string[128];
    if (newkeys & KEY_ANALOG_UP)
    {
        if(IsPlayerInAnyVehicle(playerid) && GetPlayerState(playerid) == PLAYER_STATE_DRIVER)
        if(Turbo[playerid] == 1)
        { // A compound block.........
        new Float:X, Float:Y, Float:Z;
        GetVehicleVelocity(GetPlayerVehicleID(playerid), X, Y, Z);
        SetVehicleVelocity(GetPlayerVehicleID(playerid), X+3, Y+3, Z+3);
            } // A compound block...........
return 1;
    }
}

Lol, I missed it too, you missed the ' (playerid) ' @ GetPlayerVehicleID '.