SIMPLE ALERT INDICATOR not worked ?

I guess it's not an indicator at all. Try to use it as expert. Put it into \experts forder. Compile and attach this expert.

I think using 8 indicators in an alert expert can't be said simple. :)
If everything else is in order, my guest is there is conflicting signals among the indicators.
Why don't you reduce the indicators to one or two, and see if it is working,
then you can add more indicators one by one.

Have you remove all those return(0) and non-necessary curly braces?

I compiled the following EA. It printing-comenting-alerting "OPEN BUY / CLOSE SELL..." every tick. I am with fireflies about checking "conflicting signals among the indicators"

int start()
  {
  double MA_Main,MA_Signal,SAR,MACD_Main,MACD_Signal,
         Stochastic_Main,Stochastic_Signal,RSI,RSI_Level;
  string Up,Down,Sound;
  
  MA_Main = iMA(NULL,0,5,0,MODE_LWMA,PRICE_CLOSE,0);
  MA_Signal = iMA(NULL,0,5,0,MODE_LWMA,PRICE_CLOSE,0);
  SAR = iSAR(NULL,0,0.02,0.2,0);
  MACD_Main = iMACD(NULL,0,8,17,9,PRICE_CLOSE,MODE_MAIN,0);
  MACD_Signal = iMACD(NULL,0,8,17,9,PRICE_CLOSE,MODE_SIGNAL,0);
  Stochastic_Main = iStochastic(NULL,0,8,17,9,MODE_LWMA,1,MODE_MAIN,0);
  Stochastic_Signal = iStochastic(NULL,0,8,17,9,MODE_LWMA,1,MODE_SIGNAL,0);
  RSI = iRSI(NULL,0,14,PRICE_CLOSE,0);
  RSI_Level = 50;
  Up = "OPEN BUY / CLOSE SELL" +Symbol();
  Down = "OPEN SELL / CLOSE BUY" +Symbol();
  Sound = "alert2.wav";
 
{  
/*if (MA_Main>MA_Signal && SAR<Close[0] && MACD_Main>MACD_Signal && 
    Stochastic_Main>Stochastic_Signal && RSI>RSI_Level)*/
{
Alert(Up);
Comment(Up);
PlaySound(Sound);
Print(Up);
SendMail("Forex Trading Signal",Up);
}
     return(0);
  }
 
{
if (MA_Main<MA_Signal && SAR>Close[0] && MACD_Main<MACD_Signal &&  
    Stochastic_Main<Stochastic_Signal && RSI<RSI_Level)    
{
Alert(Down);
Comment(Down);
PlaySound(Sound);
Print(Down);
SendMail("Forex Trading Signal",Down);
}
   return(0);
  }
  }

Exactly my point, try one indicator first. If this one failed, try ONE other, then ANOTHER. Don't stop with just this one.
BTW. please read carefully the highlighted lines.