"We are aware of the issues and working on a fix," Google replied https://twitter.com/googlecalendar/status/1140992105826983937, in response to a tweet.

Earlier in the day, DownDetector.com, which monitors outages, showed a number of users saw the "Not Found" "Error 404" message when they tried to access the app.

Other apps appeared to be unaffected by the outage.

(Reporting by Sayanti Chakraborty in Bengaluru; Editing by Sriraj Kalluvila)