Ideally its not a good process to post on a thread 9 months old. The plugin has changed since then and so has WordPress :)
To help keep support tickets separate, could you please open a new thread for your new question here.
Also as per the Forum Welcome,you should post your own topic.
This helps to prevent any confusion as I'm sure you understand.
We have fixed this issue in our The Google+ plugin and from your shared error message it seems the issue is caused by the Google Anayltics for WordPress plugin.
To fix this issue deactivate the Google Anayltics for WordPress plugin and The Google+ plugin by renaming the plugins folder on the following path using FTP or file manager.
Then first activate the Google Anayltics for WordPress plugin and then activate The Google+ plugin.