Hi Chris
So for some reason GetMarcBiblio is not returning a record for you.
What I would do is edit warn "error retrieving biblio $record_number"; and make it be warn "error retrieving biblio $record_number the error is $@";
And see if you get some more information that way
Yes, I did that and I have got lines like the following: .error retrieving biblio 76216 the error is No biblionumber tag for framework "DZ" at /usr/share/koha/lib/C4/Biblio.pm line 3093. I had loaded my records with "bulkmarcimport.pl" using option "-framework=DZ". The framework "DZ" was actually there but it wasn't yet populated - I have now created it using the Default (and I made a note about this). The Zebra indexing works now as expected: ... 76201.................... Records exported: 76216 Thank you so much for helping me! Best wishes: Michael