Gmail push notification error (Only one user push notification client allowed per developer)

Question

I tried to execute gmail api's watch on my two gmail accounts and it works fine.

But when the other user tried to do so, it shows this error:

HTTP error 400 : "Only one user push notification client allowed per developer (call /stop then try again)">

I don't know if the problem is on the pub/sub client configuration or doing stop and watch will resolve the problem?

Can someone explain the meaning of this statement "Only one user push notification client allowed per developer"?

Answer 1

Try using a different project for the Cloud Pub/Sub topic that the other user wants to set up a Gmail API watch on.

Answer 2

You can always renew a watch by first stopping the watch and then immediately initiating a new watch right after. So, try to use users.stop once before you use users.watch.