Need help !unable to execute custom fall back

Hi, i am receiving below error on executing my custom fall back

ERROR:rasa_core.processor:Encountered an exception while running action ‘action_default_fallback’. Bot will continue, but the actions events are lost. Make sure to fix the exception in your custom code.

my fall back action code: class ActionDefaultFallback(Action): def name(self): return “action_default_fallback”

def run(self, dispatcher, tracker, domain):
    dispatcher.utter_template("utter_unclear", tracker,
    return [ActionReverted()]

can you please help on this

Can you post the error message that is showing in your action server? This should show where the exception is happening in your