KMail/KDE 4.14.2 on Linux Mint Rosa

On starting KMail I receive the following error: "Could not create collection trash resourceId: 4".

A debian bug report points to a problem, when changing the trash directory from local to an IMAP folder.
Since I have no access to KMail, I can't change back the trash directory setting.

Any ideas which folders are to be deleted to restore the standard configuration? A simple reinstall of KMail didn't change anything.

Thanks for any help
Ralf

After an enhanced search I found https://forum.kde.org/viewtopic.php?f=215&t=120777&hilit=trash and with this I was able to solve the problem.

Sorry for me not searching thoroughly enough.

Thx, Ralf