We didn't know we had a problem with the email. We'll fix that up shortly. Thank you for let us know.
It seems somehow the plugin is trying to find the Maxmind database and prompts with a warning. the warning shouldn't be there
We are going to check this issue.
Did you try to download the maxmind database (GeoLiteCity.dat) from Options Page->Advanced Tab? That should solve the warning , while we are digging into the problem.