ActionNotFoundException: Cannot access action 'utter_axp_error', as that name is not a registered action for this domain

I am using rasa version :

Rasa Version      :         3.5.15
Minimum Compatible Version: 3.5.0
Rasa SDK Version  :         3.5.1
Python Version    :         3.7.8

The “utter_axp_error” is a response not an action as it is defined as belows:

responses:
utter_axp_error:
  - text: "What kind of error do you face?"
    buttons:
      - title: "Limit Exceeded Errors"
        payload: "/action_exceeded_limit_faqs_apicall"
      - title: "License Mismatch Errors"
        payload: "/action_lic_mismatch1_faqs_apicall"
      - title: "Developer Settings"
        payload: "/action_dev_setting_faqs_apicall"
      - title: "Others"
        payload: "/action_other_faqs_apicall"
      - title: "Back to Main Menu"
        payload: "/faq"

But why does it considers itself as an action and gives the above error ? Please help me regarding this particular error.

Below is the link to my Git repo : https://github.com/Ponharshita-P/Axcord-Chatbot