[Koha] Software error: Biblionumber

hi, i am a new koha-developer. I have a problem with my koha system, but i can´t understand it. I created one new MARC Framework changing some fields and one new item type for it. When i try to add one new record using this framework, i get this : Software error: No biblionumber tag for framework "MTS" at /usr/share/koha/lib/C4/Biblio.pm line 3135. What should i do? Thx. -- View this message in context: http://koha.1045719.n5.nabble.com/Software-error-Biblionumber-tp5747673.html Sent from the Koha-general mailing list archive at Nabble.com.