TypeError: argument of type 'NoneType' is not iterable

while i train my model it give me Error:TypeError: argument of type ‘NoneType’ is not iterable. my rasa version is :1.10.3

It’s hard for me to understand exactly what is going wrong with just this information. Could you perhaps share more information on your dataset? The nlu.md file maybe as well as the config.yml? Potentially you’ve got an intent with no examples.

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thank you so much. actually error is occurring domain.yml file.

would you please the exact solution you used ??

Thank you so much @najimali , issue has been solved actually some issue was in the formatting,