During EM client startup: contact sync errors

Hi,

I am using version 10.4.4209. During our migration from outlook 2019 to EM client I moved some contacts from a folder from our exchange account to a contact folder on a imap account (both correctly assigned in em client).

Now every time I start EM client I get a bunch of errors like this:

[CalDAV / CardDAV] Creating or updating folder ‘/Persönliches Adressbuch/Kontakte/Companies’ failed due to the following error: Cannot create folder “Companies” due to the following error(s): Not Found (NotFound).
Will attempt to create folder on next synchronization.

Unfortunately even if I click to ignore the error appears again every time I restart EM client. In the named contact folder I cannot find the subfolder “Companies”. It does not make sense to me. EM tries to sync a folder that doesn’t exist…?