Please Upgrade to the Latest Version of the AdSense Management API
If you are using a 3rd party Google Adsense App that uses the Adsense API, you may receive a message in the app that you need to upgrade API. This is a message the developer of the App will need to fix.
The operation couldn’t be completed.
(Please upgrade to the latest version of the AdSense Management API.)
The fix is documented by Google here.