code: @SuppressWarnings({ "PMD.DataflowAnomalyAnalysis",
          "PMD.AvoidCatchingGenericException",
          "PMD.UseStringBufferForStringAppends", "PMD.SystemPrintln" })
      public void printError(Error event) {
          String msg = "Unhandled " + event;
          System.err.println(msg);
          if (event.throwable() == null) {
              System.err.println("No stack trace available.");
          } else {
              event.throwable().printStackTrace();
          }
      }
docs: Prints the error.
  
  @param event the event