> <@shaliniambrose:matrix.org> Hi  I am trying to upgrade koha from Koha18.05.04.000 to Koha21.05. When I upgrade the schema, I receive the following error message
> > ISBN_RANGE_MESSAGE is set to [] but that file does not exist!
> > Trying to use the default locations
> > at /usr/share/perl5/Business/ISBN.pm line 87.
> > Can't use string ("- id: 165
> > selector: #coverflo"...) as an ARRAY ref while "strict refs" in use at
> > /var/lib/koha/library/plugins/Koha/Plugin/Com/ByWaterSolutions/CoverFlow.pm
> > line 377.
> Thanks in advance for your help.

Has anyone come across something like this?