In box subfolders suddenly gone missing

My inbox subfolders no longer there. Logged in this morning and the subfolders for one of my two addresses were not there. Where are they and how can I get them back.

Are they still visible through the web interface for that account?

If so, remove the accounts from eM Client, then add them again, and the folders should re-sync.

Thanks Gary. How do I access the web interface please?

Open your web browser and go to the web site for your email provider. Then login using the username and password for the account.

The mail and folder are there. (PlusNet). When I open eM client I get this:

OK. Backup your eM Client (Menu > File > Backup)

Now remove the account in eM Client (Menu > Tools > Accounts)

Now add the account again.