I get error with Google connect

-i set Facebook, Twitter and Google connect… Twitter and Facebook is working great, but Google is not… I followed the manual step by step but no success.

Here is the error:
apiServiceException thrown

Error calling GET https://www.googleapis.com/oauth2/v2/userinfo?key=xxxxxxxxxxxxxxxxxxxxxxxxxxx (401) Invalid Credentials

Thank you for help

http://ww.wp.xz.cn/plugins/nextend-google-connect/