"The response sent by the skill was invalid. Use JSON schema validation to validate the skill response " issue while accessing from alexa skill

Question

I am creating a virtual device for checking the connection and I am following this link for reference:
developer.amazon.com/en-US/docs/alexa/smarthome/implement-skill-tutorial.html

They are giving this link to verify JSON: Link to verify JSON

After check on that page result, There is no defect found in JSON. Test cases result

Code and response

Response

Please help me to solve this problem or please give me any suggestion to solve this issue. This is virtual device