Here’s the log since I reinstalled eM this afternoon. Had the same problem with a previous installation and uninstalled out of frustration. Wanting to try again, but this is beyond annoying.
Just to be sure, can you still receive and send emails, or to be more specific do synchronization with server without problem?
If so then just turn off error messages in Tools - Settings - General - General.
eM Client is very sensitive to internet connection and specially with IMAP folders which are synchronized 24/7 it if recognizes even slight connection issue like WiFi sleep for a second or things like that it will throw out error/s.
Anyway tell me if this will help you.