Google API problems on Professional Plugin Version

When I go to Google API- Keywords
i cannot see anything…

This is the report log

14.6.2016 – 13:08:54 google_api error We’ve connected to Google API, but we got this error: Error calling POST https://www.googleapis.com/webmasters/v3/sites/http%3A%2F%2Fwww.intellisystem.it%2Fen/searchAnalytics/query: (403) User does not have sufficient permission for site ‘http://www.intellisystem.it/en/’. See also: https://support.google.com/webmasters/answer/2451999.

How to fix it ?
I can say that google analitycs function well…
and the Google API Authorization code is working

Thanks
Regards

Cristian

https://wordpress.org/plugins/off-page-seo/