[Koha] Error message for records with multiple items

[Katharina Penner]

Dear all,

We're using Koha 3.0004019 for a few months now and seem not to be
able to eliminate a problem with holdings display in the OPAC.
Whenever one clicks on the title of a record that is either a
multi-volume work or has several copies, that is one record has
several items attached to it, an error message is displayed.
An Error has Occurred
Error 404
•	An error occurred while try to process your request.
•	To report this error, you can email the Koha Administrator.
•	Use top menu bar to navigate to another part of Koha.

Everything is fine in the staff client and all attached items are
properly listed, but not in the OPAC.

Any suggestions to eliminate the error message?
-- 
Katharina Penner
Director of Research/Learning Resources
TCM International Institute
Sattelbach 16
2532 Heiligenkreuz, NO
Phone: +43 (0)2258 8727 37
FAX: +43 (0)2258 8727 45
katharina.penner at tcmi.edu
www.tcmi.edu