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[EP-tech] EPrints 3.4.7 - Repository fails to initialize: "Can't use an undefined value as an ARRAY reference" at Language.pm line 104

CAUTION: This e-mail originated outside the University of Southampton.

Dear EPrints-Team,

I'm setting up EPrints 3.4.7 on Ubuntu 24.04. The static pages load, but
any CGI script or Perl command that tries to initialize a repository
fails with:

"Can't use an undefined value as an ARRAY reference at
/opt/eprints3/perl_lib/EPrints/Language.pm line 104."

What I've tried:

    Created a fresh test repository (epadmin create testrepo) - same
error

    Verified /opt/eprints3/flavours/pub_lib/ exists

    Added $c->{flavours} configuration to both 00_flavour.pl and
10_core.pl

    Copied language files from a working installation

    Confirmed permissions are correct (eprints:eprints)

What works:

    The static HTML pages load fine

    epadmin test sammelpunkt --verbose passes

    Apache serves the static content

What doesn't work:

    perl -I/opt/eprints3/perl_lib -e 'use EPrints; my $repo =
EPrints::Repository->new( id => "testrepro" );' fails with the same
error

    All CGI scripts return 500 Internal Server Error

The error seems to be in the Language module:
At line 104 of Language.pm, it tries to access @{
$repository->get_conf("flavours")->{$flavour} } but
$repository->get_conf("flavours") is returning undef.

Questions:

    Is there a global configuration file that defines flavours that I'm
missing?

    Could the flavours configuration be loaded from a different location
than /opt/eprints3/flavours/?

    Is there a known issue with EPrints 3.4.7 on Ubuntu 24.04?

Thank you for your help!

h.h.