[Hansrutger]

Код:

CMD:deleteveh(playerid,params[])
{
    if(!IsPlayerInAnyVehicle(playerid)) SendClientMessage(playerid, -1, "You need to be in a vehicle to use this command"); return 0; // Never do this if you plan to...
    { // ... create brackets here...
        new vehicleid = GetPlayerVehicleID(playerid);
        DestroyVehicle(vehicleid);
        SendClientMessage(playerid, COLOUR_RED,"You have removed this vehicle");
    } // ... and here
    return 1;
}

Remove the {}-brackets and you should be fine and remove the return 0, place "return" before SendClientMessage after the if-statement instead.