Invalid Mailbox Name logging failure

Since I upgraded to eM Client 8 and I moved a specific map to trash I constantly receive errors in my logging-file and appears the red triangle.

How can I solve this issue, because if I close the error-popup sceen it directly pops-up again and I won’t receive new emails.

I’m using the latest version of eM Client.

(upload://zPG5rgrxBVEtIVpRN7oJ9gS38Vw.png) ![versie eM Client|412x264]