[Clavius]

pawn Код:

if (strcmp(cmdtext, "/flip", true)==0)
    {
        new VehicleID, Float:x, Float:y, Float:z;
        GetPlayerPos(playerid, x, y, z);
        VehicleID = GetPlayerVehicleID(playerid);
        SetVehiclePos(VehicleID, x, y, z);
        SetVehicleZAngle(VehicleID, 0);
        SendClientMessage(playerid, COLOR_LIGHTBLUE,"That's better.. Vehicle Fliped!");
        return 1;
    }

Because lower-case x, y and z are not defined on a preceding level (upper case X, Y, and Z were)