anchor.diff:        try {
           _handleMessage(event);
         } catch(e) {
  -        print("service error: $e ${e.stackTrace}");
  +        printError("Service error", e);
         }
       });
     }
  
positive.code:           }
          }
        } catch(e) {
          print("service error: $e ${e.stackTrace}");
        }
      });
  
  
negative.code:     _printSendPort.send("$message");
    }
  }
  
  printError(String description, dynamic e) {
    String stackTrace;
    try {
      stackTrace = "\n${e.stackTrace}";
    } catch(e) {
      stackTrace = "";
    }
  
    print ("$description $e $stackTrace");
  }
  
  
  
  