hi David,
the system has a version of libjson-validator-perl, thats too new for koha

it's probably manually been built/installed, via the cpan2deb tool?

try the following to fix the problem...

$ sudo apt update; sudo apt upgrade libjson-validator-perl


and confirm with...

$ apt-cache policy libjson-validator-perl
libjson-validator-perl:
  Installed: 5.99+really3.14-koha1
  Candidate: 5.99+really3.14-koha1
  Version table:
 *** 5.99+really3.14-koha1 500
        500 http://debian.koha-community.org/koha 20.11/main amd64 Packages


On 15/12/21 5:23 am, David Liddle wrote:
Thank you for the informative tip, Manos. For other readers, the summary is 
that the problem may be caused  by the installation of an unacceptable version 
of a particular Perl module, JSON::Validator. What I find on our own server is 
the following:

# sudo cpan -D JSON::Validator
JSON::Validator
-------------------------------------------------------------------------
         (no description)
         J/JH/JHTHORSEN/JSON-Validator-5.04.tar.gz
         /usr/share/perl5/JSON/Validator.pm
         Installed: 5.02
         CPAN:      5.04  Not up to date
         Jan Henning Thorsen (JHTHORSEN)
         jhthor...@cpan.org

#  apt-cache policy libjson-validator-perl
libjson-validator-perl:
   Installed: 5.02-1
   Candidate: 5.02-1
   Version table:
  *** 5.02-1 100
         100 /var/lib/dpkg/status
      4.99.1+really3.14-koha3 500
         500 http://debian.koha-community.org/koha oldoldstable/main amd64 
Packages
      3.06+dfsg-1 500
         500 http://mirrors.digitalocean.com/debian buster/main amd64 Packages

Note the version contained in the Koha repository. If the version of this 
module is indeed the problem, I have to admit that I'm not sure how to go about 
forcing the installation of the correct one—Manos' solution in the GUI's 
package manager won't work in this server environment. It's a production 
instance, so I have to tread lightly. Again, my thanks go out to all readers 
and contributors!
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