After upgrading to latest server and importing a dump, it failed to start:

mbserver@mbserver-ngs:~/musicbrainz-server$ carton exec – plackup -Ilib Error while loading app.psgi: Can't locate Math/Random/Secure.pm in @INC (@INC contains: lib local/lib/perl5/i486-linux-gnu-thread-multi-64int local/lib/perl5 . /usr/share/perl/5.14 /usr/lib/perl/5.14) at lib/MusicBrainz/Server/Data/Utils.pm line 11.
BEGIN failed--compilation aborted at lib/MusicBrainz/Server/Data/Utils.pm line 11.
Compilation failed in require at lib/MusicBrainz/Server/Controller/JS.pm line 3.
BEGIN failed--compilation aborted at lib/MusicBrainz/Server/Controller/JS.pm line 3.
Compilation failed in require at local/lib/perl5/Catalyst/Utils.pm line 306.
Compilation failed in require at app.psgi line 21.
BEGIN failed--compilation aborted at app.psgi line 21.

Presumably Math::Random::Secure isn't listed in the required modules?