code: function handleError( err )
    {
  
      debugger;
  
      if( encoder && encoder.onError )
      try
      {
        err = _._err
        ({
          args : [ stack,'\nfileReadAct( ',o.filePath,' )\n',err ],
          usingSourceCode : 0,
          level : 0,
        });
        err = encoder.onError.call( self,{ error : err, operation : o, encoder : encoder })
      }
      catch( err2 )
      {
        console.error( err2 );
        console.error( err.toString() + '\n' + err.stack );
      }
  
      if( o.sync )
      {
        throw err;
      }
      else
      {
        return con.error( err );
      }
  
    }
docs: /* error