Can't get rid of error message on startup

This msg opens every time i launch eMclient. I’ve tried everything, except the right thing, without success. Can you help?

Go to the Contacts section of eM Client, then by right-click on the Gmail Contacts folder, choose Properties > Repair.

This will resync the contacts and folders with Google.

Spoke too soon; error message still pops up every time i open eM client. Can you think of any other paths to explore?

Try the repair again.

Then, don’t touch this Coworkers folder.