[Koha] Error with Plack post upgrade to Koha 25.05.00.000

[City & Guilds of London Art School Admin]

Hello,

Still troubleshooting this but my knowledge of Plack is minimal so I'm
hoping someone in the community will have some insights they're willing to
share.

After a release upgrade to *Ubuntu 22.04.5 LTS* and Koha upgrade to
*25.05.00.000*, the following  is returned in the Server Information
overview:

"PSGI: Koha is running in CGI mode. This is a security issue! Run Koha
using Plack for CSRF (cross-site request forgery) protection. More
information: koha-plack --help"

the plack-error log, I have the following:

Array found where operator expected at /usr/share/koha/lib/Koha/Patron.pm
line 2356, near "zip6 @"
(Do you need to predeclare zip6?)
"my" variable $self masks earlier declaration in same scope at
/usr/share/koha/lib/Koha/Patron.pm line 2469.
Error while loading /etc/koha/plack.psgi: syntax error at
/usr/share/koha/lib/Koha/Patron.pm line 2356, near "zip6 @"
Global symbol "%attribute_changes" requires explicit package name (did you
forget to declare "my %attribute_changes"?) at
/usr/share/koha/lib/Koha/Patron.pm line 2364.
Global symbol "$is_different" requires explicit package name (did you
forget to declare "my $is_different"?) at
/usr/share/koha/lib/Koha/Patron.pm line 2369.
Global symbol "@new_attributes" requires explicit package name (did you
forget to declare "my @new_attributes"?) at
/usr/share/koha/lib/Koha/Patron.pm line 2396.
Global symbol "$self" requires explicit package name (did you forget to
declare "my $self"?) at /usr/share/koha/lib/Koha/Patron.pm line 2437.
syntax error at /usr/share/koha/lib/Koha/Patron.pm line 2441, near "}"
Can't use global @_ in "my" at /usr/share/koha/lib/Koha/Patron.pm line
2452, near "= @_"
Global symbol "$self" requires explicit package name (did you forget to
declare "my $self"?) at /usr/share/koha/lib/Koha/Patron.pm line 2453.
syntax error at /usr/share/koha/lib/Koha/Patron.pm line 2455, near "}"
Can't use global @_ in "my" at /usr/share/koha/lib/Koha/Patron.pm line
2469, near "= @_"
/usr/share/koha/lib/Koha/Patron.pm has too many errors.
Compilation failed in require at /usr/share/koha/lib/Koha/ILL/Request.pm
line 47.
BEGIN failed--compilation aborted at
/usr/share/koha/lib/Koha/ILL/Request.pm line 47.
Compilation failed in require at /usr/share/koha/lib/Koha/ILL/Requests.pm
line 23.
BEGIN failed--compilation aborted at
/usr/share/koha/lib/Koha/ILL/Requests.pm line 23.
Compilation failed in require at /usr/share/koha/lib/C4/Circulation.pm line
48.
BEGIN failed--compilation aborted at /usr/share/koha/lib/C4/Circulation.pm
line 48.
Compilation failed in require at /usr/share/koha/lib/Koha/Items.pm line 27.
BEGIN failed--compilation aborted at /usr/share/koha/lib/Koha/Items.pm line
27.
Compilation failed in require at /usr/share/koha/lib/Koha/ArticleRequest.pm
line 26.
BEGIN failed--compilation aborted at
/usr/share/koha/lib/Koha/ArticleRequest.pm line 26.
Compilation failed in require at
/usr/share/koha/lib/Koha/ArticleRequests.pm line 25.
BEGIN failed--compilation aborted at
/usr/share/koha/lib/Koha/ArticleRequests.pm line 25.
Compilation failed in require at /usr/share/koha/lib/Koha/Patrons.pm line
26.
BEGIN failed--compilation aborted at /usr/share/koha/lib/Koha/Patrons.pm
line 26.
Compilation failed in require at /usr/share/koha/lib/C4/Budgets.pm line 24.
BEGIN failed--compilation aborted at /usr/share/koha/lib/C4/Budgets.pm line
24.
Compilation failed in require at /usr/share/koha/lib/C4/Biblio.pm line 90.
BEGIN failed--compilation aborted at /usr/share/koha/lib/C4/Biblio.pm line
90.
Compilation failed in require at /usr/share/koha/lib/Koha/Biblio.pm line 28.
BEGIN failed--compilation aborted at /usr/share/koha/lib/Koha/Biblio.pm
line 28.
Compilation failed in require at /usr/share/koha/lib/Koha/Biblios.pm line
24.
BEGIN failed--compilation aborted at /usr/share/koha/lib/Koha/Biblios.pm
line 24.
Compilation failed in require at /usr/share/koha/lib/Koha/Libraries.pm line
24.
BEGIN failed--compilation aborted at /usr/share/koha/lib/Koha/Libraries.pm
line 24.
Compilation failed in require at /usr/share/koha/lib/C4/Koha.pm line 27.
BEGIN failed--compilation aborted at /usr/share/koha/lib/C4/Koha.pm line 27.
Compilation failed in require at /etc/koha/plack.psgi line 29.
BEGIN failed--compilation aborted at /etc/koha/plack.psgi line 29.
Child process 4895 exited with status 255

==

Other details:

perl --version: "This is perl 5, version 34, subversion 0 (v5.34.0)"
mysql --version: Ver 15.1 Distrib 10.6.22-MariaDB

All required perl modules are installed according to About Koha -> Perl
Modules.

Output from koha-plack --status is this when run as an ordinary user:










*koha-plack --status <instance>WARNING: koha-plack requires some Apache
modules that you are missing.You can install them with:    sudo a2enmod
headers proxy_http Permission denied:
/etc/koha/sites/<instance>/koha-conf.xmlPermission denied:
/etc/koha/sites/<instance>/koha-conf.xmlfailed to load external entity
"/etc/koha/sites/<instance>/koha-conf.xml" * Plack running for <instance> *

But when run as sudo I have:



*sudo koha-plack --status <instance>[sudo] password for systems:  * Plack
running for <instance>*

This makes me think there's a permissions issue, but so far I don't see
where that could be. Also, the php modules "headers" and "proxy_http" are
definitely installed and enabled.

Thanks and all the best,

Chris