Error with no description

The link below will provide useful information

https://docs.mql4.com/constants/namedconstants/uninit 

You may need to further develop the getUninitReasonText function if you want it to print the description of all the reason codes.

Cheers. 

Yes ... printed by my code ... what can I do please ?

void OnDeinit(const int reason)
  {
//--- The first way to get the uninitialization reason code
   Print(__FUNCTION__,"_Uninitalization reason code = ",reason);
//--- The second way to get the uninitialization reason code
   Print(__FUNCTION__,"_UninitReason = ",getUninitReasonText(_UninitReason));

  }

string getUninitReasonText(int reasonCode)
  {
   string text="";
   switch(reasonCode)
     {
      case REASON_ACCOUNT:
         text="Account was changed";break;
      case REASON_CHARTCHANGE:
         text="Symbol or timeframe was changed";break;
      case REASON_CHARTCLOSE:
         text="Chart was closed";break;
      case REASON_PARAMETERS:
         text="Input-parameter was changed";break;
      case REASON_RECOMPILE:
         text="Program "+__FILE__+" was recompiled";break;
      case REASON_REMOVE:
         text="Program "+__FILE__+" was removed from chart";break;
      case REASON_TEMPLATE:
         text="New template was applied to chart";break;
      default:text="Another reason";
     }
   return text;
  }

Thank you ... see above... I am already using it !

Any ideas ?

Thank you very much. Now I need to understand why ?

Thank you 

You closed the terminal, i.e. File → Exit, Close button, called TerminalClose, or Windows shutdown.