Need help after new MT4 B600 updated

//+------------------------------------------------------------------+
//| Program's sub-function                                           |   
//+------------------------------------------------------------------+
   int ReadMaxHistoricalBars ( int Interval )
   {
   
      switch ( Interval )
      {
         case PERIOD_MN1 : return ( 50 ) ;
         case PERIOD_W1  : return ( 50 ) ;
         case PERIOD_D1  : return ( 50 ) ;
         case PERIOD_H4  : return ( 50 ) ;
         case PERIOD_H1  : return ( 50 ) ;
         case PERIOD_M30 : return ( 50 ) ;
         case PERIOD_M15 : return ( 50 ) ;
         case PERIOD_M5  : return ( 50 ) ;
         case PERIOD_M1  : return ( 50 ) ;
         default:          return (  0 ) ; //or whatever you want
      }
      
   }
//+------------------------------------------------------------------+

Okay somethings wrong after doing that

you can return whatever you want aiready written above

//or whatever you want

but this is not the problem

//+------------------------------------------------------------------+
//| Program's sub-function                                           |   
//+------------------------------------------------------------------+
   int ReadMaxHistoricalBars ( int Interval )
   {
   
      switch ( Interval )
      {
         case PERIOD_MN1 :
            return ( 50 );
            break;
         case PERIOD_W1  :
            return ( 50 ) ;
            break;
         case PERIOD_D1  :
            return ( 50 ) ;
            break;
         case PERIOD_H4  :
            return ( 50 ) ;
            break;
         case PERIOD_H1  :
            return ( 50 ) ;
            break;
         case PERIOD_M30 :
            return ( 50 ) ;
            break;
         case PERIOD_M15 :
            return ( 50 ) ;
            break;
         case PERIOD_M5  :
            return ( 50 ) ;
            break;
         case PERIOD_M1  :
            return ( 50 ) ;
            break;
         default:
            return (  0 ) ;
            break; //or whatever you want
      }
      
   }
//+------------------------------------------------------------------+

excuse me sir but all the errors you are talking about is not related in any way to B600>
it's basics in programing

its fine before 600

AcquiredBars is local to the 2nd for loop.

If you need to retain the value between different blocks of code declare it before the for()

int AcquiredBars;   //Declare it here
for ( int i = 0 ; i < 10 ; i++ ) 
    //int AcquiredBars    //Or here
         {
            for ( int x = 0 ; x < TotalPairs ; x++ )
            {
               AcquiredBars = iBars ( MajorPairs[x] , Interval ) ;
               
               
               
               if ( Error != 0 || AcquiredBars < HistoricalBars )
               {
                  continue ;
               }
               else
               {
                  break ;
               }
            }
            
            
            
               if ( i == 9 && ( Error != 0 || AcquiredBars < HistoricalBars ) )
               {
                  return ( False ) ;
               }
         }

ok thank you, it becomes warning now

Common Errors in MQL4 Programs and How to Avoid Them