Error:"deleted_client", Description:"The OAuth client was deleted.", Uri:""

[Rohail Abbas]

I have a utility that sends Google Calendar Events through API. I generate a token from oAuth client Credentials and it has been working fine for a year.

For last couple of months Google has started deleting the token from the server and gives this error

Error:"deleted_client", Description:"The OAuth client was deleted.", Uri:""

After that, I create the token again and it starts working fine and then deletes again after few hours.

I don't understand how to avoid this from happening. Please help

Thanks

Rohail