Error message: incorrect setting, keeps occuring

I keep getting the above error message when I send emails. The “Burin Kantabutra” referred to in the error message is me; the account settings are correct.

I use Gmail, Chrome v. 36.0.1985.125, Windows 7 Home, and eM Client 6.0.20648.0. I do not get this error message with any other email client I’ve tried (Thunderbird, Outlook, and Gmail). I’ve tried uninstalling and re-installing eM Client, to no avail.

Many thanks. 

Hi Burin, are you having any actual issues except this error, e.g. are you having issues synchronizing your calendars/contacts with your gmail account?
What synchronization period do you have setup in eM Client?

Thank you,