iMA not loading

[[Deleted]]

#property version   "1.00"
#property indicator_chart_window
#property indicator_buffers 1
#property indicator_plots 0

int  handle;
int hix,lix,lvb,_fvb,_clb,fvb=-1,clb=-1;
double buff[];
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int OnInit() {
//--- indicator buffers mapping
   SetIndexBuffer(0,buff,INDICATOR_CALCULATIONS);
   handle = iMA(NULL,0,12,0,MODE_SMA,MODE_CLOSE);
//---
   return(INIT_SUCCEEDED);
}
//+------------------------------------------------------------------+
//| Custom indicator iteration function                              |
//+------------------------------------------------------------------+
int OnCalculate(const int rates_total,
                const int prev_calculated,
                const datetime &time[],
                const double &open[],
                const double &high[],
                const double &low[],
                const double &close[],
                const long &tick_volume[],
                const long &volume[],
                const int &spread[]) {
//---
   FindHighLow();
   ArrayResize(buff,(MathMax(hix,lix))+1);
   CopyBuffer(handle,0,MathMin(hix,lix),((MathMax(hix,lix)-MathMin(hix,lix))),buff);


  // for
//--- return value of prev_calculated for next call
   return(rates_total);
}


//| Find HighLow on Visible Chart Window                             |
//+------------------------------------------------------------------+
void FindHighLow() {

   _fvb=(int)ChartGetInteger(ChartID(),CHART_FIRST_VISIBLE_BAR,0);
   _clb=(int)ChartGetInteger(ChartID(),CHART_WIDTH_IN_BARS,0);
   if (_fvb>0 &&(_fvb!=fvb||_clb!=clb)) {
      lvb=_fvb-(_clb-1);
      if (lvb<0) {
         lvb=0;
      }
      hix= iHighest(NULL,0,MODE_HIGH,(_fvb-lvb),lvb); // Highest Index of High
      lix= iLowest(NULL,0,MODE_LOW,(_fvb-lvb),lvb); // Highest Index of Low


      ChartRedraw(ChartID());
      //then we store the following to track changes
      fvb=_fvb;
      clb=_clb;
   }
}
//+------------------------------------------------------------------+

I am trying to Load iMA between high and low on scrolling chart but its not appearing on chart, here is my code 

thanks