title: Failed to fill utterance template - Rasa Chatbot
body: <p>First I ran the command <code>rasa run actions</code> and then I ran <code>rasa train</code> and then <code>rasa x</code>. I get an error.</p>
  <p>Failed to fill utterance template 'Play the game [ ] {mario_link}'. Tried to replace 'mario_link' but could not find a value for it. There is no slot with this name nor did you pass the value explicitly when calling the template. Return template without filling the template.</p>
  <p>domain.yml file</p>
  <pre><code>session_config:
    session_expiration_time: 60
    carry_over_slots_to_new_session: true
  intents:
  - mario
  responses:
    utter_game_mario:
    - text: Play the game [ ] {mario_link}
  actions:
  - action_mario
  </code></pre>
  <p>actions.py file</p>
  <pre><code>from typing import Any, Text, Dict, List
  from rasa_sdk import Action, Tracker
  from rasa_sdk.executor import CollectingDispatcher
  
  
  class ActionHelloWorld(Action):
      def name(self) -&gt; Text:
          return &quot;action_mario&quot;
  
      def run(self, dispatcher: CollectingDispatcher,
              tracker: Tracker,
              domain: Dict[Text, Any]) -&gt; List[Dict[Text, Any]]:
              # dispatcher.utter_message(text=&quot;Hello World!&quot;)
  
              link = &quot;https://supermarioemulator.com/supermario.php&quot;
  
              dispatcher.utter_template(&quot;utter_game_mario&quot;, tracker, link=link)
              return []
  </code></pre>
  <p>nlu.md file</p>
  <pre><code>## intent:mario
  - i want to play mario
  - start mario
  - play mario
  </code></pre>
  <p>endpoints.yml file</p>
  <pre><code>action_endpoint:
    url: &quot;http://localhost:5055/webhook&quot;
  </code></pre>
  <p>stories.md file</p>
  <pre><code>## game
  * mario
      - action_mario
  </code></pre>
  <p>I have used these references and did not work for me: <br />
  </p>
  <li>Re-installed latest version of Rasa: https://forum.rasa.com/t/getting-an-error-while-using-custom-output-payload/11802</li><br />
  <li>No idea what the solution is here: https://github.com/RasaHQ/rasa/issues/4550</li><br />
  <li>This did not make any sense: https://github.com/RasaHQ/rasa/pull/4079/files/6c14ab262e915369915876425670843ab348201e</li><br />
  
  <p>Please help. Why am I getting this error?</p>