Error 403

[childselfytech]

https://api.api.ai/v1/ : Error 403 showing and chatbot stops working. Kindly help me to solve the same

Error showing is:

SEC7120: [CORS] The origin 'file://' did not find 'file://' in the Access-Control-Allow-Origin response header for cross-origin resource at 'https://api.api.ai/v1/query?v=20150910'.

HTTP403: FORBIDDEN - The server understood the request, but is refusing to fulfill it. (XHR)POST - https://api.api.ai/v1/query?v=20150910

SEC7120: [CORS] The origin 'file://' did not find 'file://' in the Access-Control-Allow-Origin response header for cross-origin resource at 'https://api.api.ai/v1/query?v=20150910'.

HTTP403: FORBIDDEN - The server understood the request, but is refusing to fulfill it. (XHR)POST - https://api.api.ai/v1/query?v=20150910

javascript error-handling dialogflow chatbot