Synching issue

There is a synching issue that I can’t fix:

12:36:00   MailClient.Storage.Application.OperationException: Synchronizing folder ‘bel…@…’ failed due to the following error: Execution of request failed:… (Temporary problem - please try again later.)

What do I do to fix it?

If this is an IMAP account, one option is to remove the account from eM Client, then add it again.