[Koha] Lists not downloading from OPAC

[Elaine Bradtke]

Koha 22.11.04
Lists work as expected in the staff interface. But in the OPAC, the email
and print features work, but the download does not.  We get a 500 error
message.
I can save the information directly to Zotero, but attempting to download a
list, in any format, gives the same error.

I searched the system settings for lists and download, and even ISBD, but
found nothing useful.  Suggestions?

Elaine Bradtke
VWML <https://www.vwml.org>
English Folk Dance and Song Society <https://www.efdss.org>
Cecil Sharp House, 2 Regent's Park Road, London NW1 7AY
Tel    +44 (0) 20 7485 2206 (This number is for the English Folk Dance and
Song Society in London, England. If you wish to phone me personally, send
an e-mail first. I work off site)
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Registered Company No. 297142
Charity Registered in England and Wales No. 305999