Resolver RT::URI::fsck_com_rt could not parse fsck.com-rt:

After displaying a ticket I get the following warning in rt.log (queue is
"LBS"):
[warning]: Resolver RT::URI::fsck_com_rt could not parse fsck.com-rt://LBS
(Organization)/ticket/19 (/usr/share/request-tracker3/lib/RT/URI.pm:123)

This warning appears 10 times, when displaying tickets of other queues there
is the same warning.

What’s the problem there?
How to solve it?

Newbie in RT - and sorry for my bad English…
Wolfgang Hartter