C:\Users\Viddo\Desktop\LARP 4.0\LARP 4.0 D\gamemodes\larp.pwn(27670) : error 029: invalid expression, assumed zero

if(pveh == 510 || pveh == 462 || pveh == 481 || pveh == 509) return 1;)

C:\Users\Viddo\Desktop\LARP 4.0\LARP 4.0 D\gamemodes\larp.pwn(27624) : warning 219: local variable "idcar" shadows a variable at a preceding level

 new idcar = GetPlayerVehicleID(playerid);

if(pveh == 510 || pveh == 462 || pveh == 481 || pveh == 509) return 1;

idcar = GetPlayerVehicleID(playerid);

if(!strcmp(cmd, "/engine", true))
    {
        if(IsPlayerConnected(playerid))
        {
            if(IsPlayerInAnyVehicle(playerid))
            {
                if(!engineOn[GetPlayerVehicleID(playerid)])
                {
                    if(GetPlayerState(playerid) == PLAYER_STATE_PASSENGER) return 1;
                    if(pveh == 510 || pveh == 462 || pveh == 481 || pveh == 509) return 1;
                    if(IsARentableBike(idcar))
                    {
                        if(HireCar[playerid] != idcar) return 1;
                    }
                    if(IsAHarvest(idcar)) return 1;
                    if(IsADrugHarvest(idcar)) return 1;
                    if(IsASweeper(idcar)) return 1;
                    if(IsASalesVehicle(idcar)) return 1;


                    if(CanTurnEngine[playerid] != idcar && CanTurnEngine[playerid] == 9999)
                        return SendClientMessage(playerid, COLOR_GREY,"* You cannot turn this car's engine!");

                    format(string, sizeof(string), "* %s spins a key and tries to start vehicle engine.", sendername);
                    ProxDetector(30.0, playerid, string, COLOR_CHAT1,COLOR_CHAT2,COLOR_CHAT3,COLOR_CHAT4,COLOR_CHAT5);
                    if(PlayerInfo[playerid][pAdmin] < 1337 && PlayerInfo[playerid][pAdminDuty] == 1)
                    {
                        SetTimerEx("StartingTheVehicle",1,0,"i",playerid);
                    }
                    else
                    {
                        SetTimerEx("StartingTheVehicle",3500,0,"i",playerid);
                    }
                    GameTextForPlayer(playerid, "~w~Starting vehicle engine...",3500,3);
                    gEngine[playerid] = 1;
                    new y, m, d;
                    new h,mi,s;
                    getdate(y,m,d);
                    gettime(h,mi,s);
                    format(string,sizeof(string), "(%d/%d/%d)[%d:%d:%d] %s [CMD] -> /engine",d,m,y,h,mi,s,sendername);
                    CommandLog(string);
                    return 1;
                }
                else if(engineOn[GetPlayerVehicleID(playerid)])
                {
                    if(GetPlayerState(playerid) == PLAYER_STATE_PASSENGER) return 1;
                    if(pveh == 510 || pveh == 462 || pveh == 481 || pveh == 509) return 1;
                    if(IsARentableBike(idcar))
                    {
                        if(HireCar[playerid] != idcar) return 1;
                    }
                    if(IsAHarvest(idcar)) return 1;
                    if(IsADrugHarvest(idcar)) return 1;
                    if(IsASweeper(idcar)) return 1;

                    if(CanTurnEngine[playerid] != idcar && CanTurnEngine[playerid] == 9999)
                        return SendClientMessage(playerid, COLOR_GREY,"* You cannot turn this car's engine!");

                    format(string, sizeof(string), "* %s spins a key and turns off the engine.", sendername);
                    ProxDetector(30.0, playerid, string, COLOR_CHAT1,COLOR_CHAT2,COLOR_CHAT3,COLOR_CHAT4,COLOR_CHAT5);
                    GameTextForPlayer(playerid, "~w~Engine Turned Off.",3500,3);
                    gEngine[playerid] = 0;
                    engineOn[GetPlayerVehicleID(playerid)] = false;
                    TogglePlayerControllable(playerid, 0);//// ath the dealship's in the game, you can go there and try to get a car, buy when you do /v it spawns you a car, but you can take it away, idk how you can buy it,can you fix it where they cant leave with the car, they have to buy it first?
                    new y, m, d;
                    new h,mi,s;
                    getdate(y,m,d);
                    gettime(h,mi,s);
                    format(string,sizeof(string), "(%d/%d/%d)[%d:%d:%d] %s [CMD] -> /engine",d,m,y,h,mi,s,sendername);
                    CommandLog(string);
                    return 1;
                }
            }
        }
        return 1;
    }