[imp] Imp shows error message while opening folders

[martin hochreiter]

Hi!

I am knew at horde and imp.
I try this plattform as substitution for my imap server (with
integrated, but very slow) webmail.

I installed and configured horde and imp and could successfully log
on to imp and receive my emails. But if I click on folders just
the 'Inbox' folder is shown and 3 'Undefined property: messages in 
....horde/tree.php' occurs.

How can I fix that?

lg