code: def run(self):
      if self.counter > 0:
          logger.info(f"Running the app {self.counter}")
          image_str = b"it is not a pickle"
          if self.pickle_checker.run(image_str):
              self.slack.send_message("It's a pickle!")
          else:
              self.slack.send_message("It's not a pickle!")
          self.counter -= 1
      else:
          self.stop("Pickle or Not End")
  
file_path: pytorch-lightning/examples/app/pickle_or_not/app.py
imports: import logging
  from lightning.app import LightningApp, LightningFlow, LightningWork
label_desc: Use image node_id 2 for calling the RootComponent obj's underlying member method code with example usage: obj.run() without return types