code: def get_app():
      if APP is None:
          raise Exception(
              dedent(
                  """
                  App object is not yet defined.  `app = dash.Dash()` needs to be run
                  before `dash.get_app()` is called and can only be used within apps that use
                  the `pages` multi-page app feature: `dash.Dash(use_pages=True)`.
  
                  `dash.get_app()` is used to get around circular import issues when Python files
                  within the pages/` folder need to reference the `app` object.
                  """
              )
          )
      return APP
  
label_desc: Use image node_id 1 for calling a global function with example usage: get_app() and returns: APP