code: def do_execute(self):
          
          result = None
          evl = self.input.payload
          pltclassifier.plot_classifier_errors(
              evl.predictions,
              absolute=bool(self.resolve_option("absolute")),
              max_relative_size=int(self.resolve_option("max_relative_size")),
              absolute_size=int(self.resolve_option("absolute_size")),
              title=self.resolve_option("title"),
              outfile=self.resolve_option("outfile"),
              wait=bool(self.resolve_option("wait")))
          return result
docs: The actual execution of the actor.
  
          :return: None if successful, otherwise error message
          :rtype: str