Tried to add the same release 3 times and every time got "Internal Server Error".

After filling fields on first page on "Add Release" got this when tried to move to track list:

Couldn't render template "undef error - Attribute (params) does not pass the type constraint because: Validation failed for 'HashRef' with value undef at accessor HTML::FormHandler::params (defined at local/lib/perl5/HTML/FormHandler.pm line 307) line 4.
HTML::FormHandler::params('MusicBrainz::Server::Form::ReleaseEditor::Information=HASH(0x...', undef) called at local/lib/perl5/HTML/FormHandler.pm line 565
HTML::FormHandler::setup_form('MusicBrainz::Server::Form::ReleaseEditor::Information=HASH(0x...', 'params', undef) called at local/lib/perl5/HTML/FormHandler.pm line 410
HTML::FormHandler::process('MusicBrainz::Server::Form::ReleaseEditor::Information=HASH(0x...', 'params', undef) called at lib/MusicBrainz/Server/Form.pm line 113
MusicBrainz::Server::Form::unserialize('MusicBrainz::Server::Form::ReleaseEditor::Information=HASH(0x...', 'HASH(0xe1d0e70)') called at lib/MusicBrainz/Server/Wizard.pm line 524
MusicBrainz::Server::Wizard::_load_form('MusicBrainz::Server::Wizard::ReleaseEditor::Add=HASH(0xc9d99b8)', 0, 'serialized', 'HASH(0xe1d0e70)') called at lib/MusicBrainz/Server/Wizard.pm line 238
MusicBrainz::Server::Wizard::_load_page('MusicBrainz::Server::Wizard::ReleaseEditor::Add=HASH(0xc9d99b8)', 0, undef) called at lib/MusicBrainz/Server/Wizard.pm line 219
MusicBrainz::Server::Wizard::load_page('MusicBrainz::Server::Wizard::ReleaseEditor::Add=HASH(0xc9d99b8)', 'information') called at lib/MusicBrainz/Server/Plugin/Wizard.pm line 25
MusicBrainz::Server::Plugin::Wizard::page('MusicBrainz::Server::Plugin::Wizard=HASH(0xc1e1460)', 'information') called at /home/musicbrainz/musicbrainz-server/root/release/edit/tracklist.tt line 123
eval

{...} called at /home/musicbrainz/musicbrainz-server/root/release/edit/tracklist.tt line 123
eval {...}

called at /home/musicbrainz/musicbrainz-server/root/release/edit/tracklist.tt line 7
Template::Document::_ANON_('Template::Context=HASH(0xb834408)') called at local/lib/perl5/x86_64-linux-gnu-thread-multi/Template/Document.pm line 163
eval

{...} called at local/lib/perl5/x86_64-linux-gnu-thread-multi/Template/Document.pm line 161
Template::Document::process('Template::Document=HASH(0xe05a3b8)', 'Template::Context=HASH(0xb834408)') called at local/lib/perl5/x86_64-linux-gnu-thread-multi/Template/Context.pm line 347
eval {...}

called at local/lib/perl5/x86_64-linux-gnu-thread-multi/Template/Context.pm line 321
Template::Context::process('Template::Context=HASH(0xb834408)', 'Template::Document=HASH(0xe05a3b8)') called at local/lib/perl5/x86_64-linux-gnu-thread-multi/Template/Service.pm line 94
eval

{...} called at local/lib/perl5/x86_64-linux-gnu-thread-multi/Template/Service.pm line 91
Template::Service::process('Template::Service=HASH(0xb6c8ba0)', 'release/edit/tracklist.tt', 'HASH(0xe0443b0)') called at local/lib/perl5/x86_64-linux-gnu-thread-multi/Template.pm line 66
Template::process('Template=HASH(0xa177248)', 'release/edit/tracklist.tt', 'HASH(0xe0443b0)', 'SCALAR(0x4783f80)') called at local/lib/perl5/Catalyst/View/TT.pm line 263
Catalyst::View::TT::render('MusicBrainz::Server::View::Default=HASH(0xb7a1568)', 'MusicBrainz::Server=HASH(0xc49b208)', 'release/edit/tracklist.tt') called at local/lib/perl5/Catalyst/View/TT.pm line 223
eval {...}

called at local/lib/perl5/Catalyst/View/TT.pm line 223
Catalyst::View::TT::process('MusicBrainz::Server::View::Default=HASH(0xb7a1568)', 'MusicBrainz::Server=HASH(0xc49b208)') called at lib/MusicBrainz/Server/View/Default.pm line 18
MusicBrainz::Server::View::Default::process('MusicBrainz::Server::View::Default=HASH(0xb7a1568)', 'MusicBrainz::Server=HASH(0xc49b208)') called at local/lib/perl5/Catalyst/Action.pm line 65
Catalyst::Action::execute('Catalyst::Action=HASH(0xe02d708)', 'MusicBrainz::Server::View::Default=HASH(0xb7a1568)', 'MusicBrainz::Server=HASH(0xc49b208)') called at local/lib/perl5/Catalyst.pm line 1672
eval

{...} called at local/lib/perl5/Catalyst.pm line 1672
Catalyst::execute('MusicBrainz::Server=HASH(0xc49b208)', 'MusicBrainz::Server::View::Default', 'Catalyst::Action=HASH(0xe02d708)') called at local/lib/perl5/Catalyst/Plugin/StackTrace.pm line 94
Catalyst::Plugin::StackTrace::execute('MusicBrainz::Server=HASH(0xc49b208)', 'MusicBrainz::Server::View::Default', 'Catalyst::Action=HASH(0xe02d708)') called at local/lib/perl5/Catalyst/Action.pm line 60
Catalyst::Action::dispatch('Catalyst::Action=HASH(0xe02d708)', 'MusicBrainz::Server=HASH(0xc49b208)') called at local/lib/perl5/Catalyst/Dispatcher.pm line 257
Catalyst::Dispatcher::_do_forward('Catalyst::Dispatcher=HASH(0x39b4ea0)', 'forward', 'MusicBrainz::Server=HASH(0xc49b208)', 'MusicBrainz::Server::View::Default=HASH(0xb7a1568)') called at local/lib/perl5/Catalyst/Dispatcher.pm line 237
Catalyst::Dispatcher::forward('Catalyst::Dispatcher=HASH(0x39b4ea0)', 'MusicBrainz::Server=HASH(0xc49b208)', 'MusicBrainz::Server::View::Default=HASH(0xb7a1568)') called at local/lib/perl5/Catalyst.pm line 362
Catalyst::forward('MusicBrainz::Server=HASH(0xc49b208)', 'MusicBrainz::Server::View::Default=HASH(0xb7a1568)') called at local/lib/perl5/Catalyst/Action/RenderView.pm line 57
Catalyst::Action::RenderView::execute('Catalyst::Action::RenderView=HASH(0xbccc110)', 'MusicBrainz::Server::Controller::Root=HASH(0xb9342d0)', 'MusicBrainz::Server=HASH(0xc49b208)') called at local/lib/perl5/Catalyst.pm line 1672
eval {...}

called at local/lib/perl5/Catalyst.pm line 1672
Catalyst::execute('MusicBrainz::Server=HASH(0xc49b208)', 'MusicBrainz::Server::Controller::Root', 'Catalyst::Action::RenderView=HASH(0xbccc110)') called at local/lib/perl5/Catalyst/Plugin/StackTrace.pm line 94
Catalyst::Plugin::StackTrace::execute('MusicBrainz::Server=HASH(0xc49b208)', 'MusicBrainz::Server::Controller::Root', 'Catalyst::Action::RenderView=HASH(0xbccc110)') called at local/lib/perl5/Catalyst/Action.pm line 60
Catalyst::Action::dispatch('Catalyst::Action::RenderView=HASH(0xbccc110)', 'MusicBrainz::Server=HASH(0xc49b208)') called at local/lib/perl5/Catalyst/Controller.pm line 171
Catalyst::Controller::_END('MusicBrainz::Server::Controller::ReleaseEditor::Add=HASH(0xb9...', 'MusicBrainz::Server=HASH(0xc49b208)') called at local/lib/perl5/Catalyst/Action.pm line 65
Catalyst::Action::execute('Catalyst::Action=HASH(0xbb764e8)', 'MusicBrainz::Server::Controller::ReleaseEditor::Add=HASH(0xb9...', 'MusicBrainz::Server=HASH(0xc49b208)') called at local/lib/perl5/Catalyst.pm line 1672
eval

{...} called at local/lib/perl5/Catalyst.pm line 1672
Catalyst::execute('MusicBrainz::Server=HASH(0xc49b208)', 'MusicBrainz::Server::Controller::ReleaseEditor::Add', 'Catalyst::Action=HASH(0xbb764e8)') called at local/lib/perl5/Catalyst/Plugin/StackTrace.pm line 94
Catalyst::Plugin::StackTrace::execute('MusicBrainz::Server=HASH(0xc49b208)', 'MusicBrainz::Server::Controller::ReleaseEditor::Add', 'Catalyst::Action=HASH(0xbb764e8)') called at local/lib/perl5/Catalyst/Action.pm line 60
Catalyst::Action::dispatch('Catalyst::Action=HASH(0xbb764e8)', 'MusicBrainz::Server=HASH(0xc49b208)') called at local/lib/perl5/Catalyst/Dispatcher.pm line 257
Catalyst::Dispatcher::_do_forward('Catalyst::Dispatcher=HASH(0x39b4ea0)', 'forward', 'MusicBrainz::Server=HASH(0xc49b208)', '_END') called at local/lib/perl5/Catalyst/Dispatcher.pm line 237
Catalyst::Dispatcher::forward('Catalyst::Dispatcher=HASH(0x39b4ea0)', 'MusicBrainz::Server=HASH(0xc49b208)', '_END') called at local/lib/perl5/Catalyst.pm line 362
Catalyst::forward('MusicBrainz::Server=HASH(0xc49b208)', '_END') called at local/lib/perl5/Catalyst/Controller.pm line 135
Catalyst::Controller::_DISPATCH('MusicBrainz::Server::Controller::ReleaseEditor::Add=HASH(0xb9...', 'MusicBrainz::Server=HASH(0xc49b208)') called at local/lib/perl5/Catalyst/Action.pm line 65
Catalyst::Action::execute('Catalyst::Action=HASH(0xbccc038)', 'MusicBrainz::Server::Controller::ReleaseEditor::Add=HASH(0xb9...', 'MusicBrainz::Server=HASH(0xc49b208)') called at local/lib/perl5/Catalyst.pm line 1672
eval {...}

called at local/lib/perl5/Catalyst.pm line 1672
Catalyst::execute('MusicBrainz::Server=HASH(0xc49b208)', 'MusicBrainz::Server::Controller::ReleaseEditor::Add', 'Catalyst::Action=HASH(0xbccc038)') called at local/lib/perl5/Catalyst/Plugin/StackTrace.pm line 94
Catalyst::Plugin::StackTrace::execute('MusicBrainz::Server=HASH(0xc49b208)', 'MusicBrainz::Server::Controller::ReleaseEditor::Add', 'Catalyst::Action=HASH(0xbccc038)') called at local/lib/perl5/Catalyst/Action.pm line 60
Catalyst::Action::dispatch('Catalyst::Action=HASH(0xbccc038)', 'MusicBrainz::Server=HASH(0xc49b208)') called at local/lib/perl5/Catalyst/Dispatcher.pm line 257
Catalyst::Dispatcher::_do_forward('Catalyst::Dispatcher=HASH(0x39b4ea0)', 'forward', 'MusicBrainz::Server=HASH(0xc49b208)', '/release_editor/_DISPATCH') called at local/lib/perl5/Catalyst/Dispatcher.pm line 237
Catalyst::Dispatcher::forward('Catalyst::Dispatcher=HASH(0x39b4ea0)', 'MusicBrainz::Server=HASH(0xc49b208)', '/release_editor/_DISPATCH') called at local/lib/perl5/Catalyst.pm line 362
Catalyst::forward('MusicBrainz::Server=HASH(0xc49b208)', '/release_editor/_DISPATCH') called at local/lib/perl5/Catalyst/Dispatcher.pm line 105
Catalyst::Dispatcher::dispatch('Catalyst::Dispatcher=HASH(0x39b4ea0)', 'MusicBrainz::Server=HASH(0xc49b208)') called at local/lib/perl5/Catalyst.pm line 1618
Catalyst::dispatch('MusicBrainz::Server=HASH(0xc49b208)') called at lib/MusicBrainz/Server.pm line 303
MusicBrainz::Server::_ANON_() called at lib/MusicBrainz/Server.pm line 295
MusicBrainz::Server::with_translations('MusicBrainz::Server=HASH(0xc49b208)', 'CODE(0xc7311d0)') called at lib/MusicBrainz/Server.pm line 304
Class::MOP::Class:::around('CODE(0x2c191f8)', 'MusicBrainz::Server=HASH(0xc49b208)') called at local/lib/perl5/x86_64-linux-gnu-thread-multi/Class/MOP/Method/Wrapped.pm line 162
Class::MOP::Method::Wrapped::_ANON_('MusicBrainz::Server=HASH(0xc49b208)') called at lib/MusicBrainz/Server.pm line 317
Class::MOP::Class:::around('CODE(0x4632228)', 'MusicBrainz::Server=HASH(0xc49b208)') called at local/lib/perl5/x86_64-linux-gnu-thread-multi/Class/MOP/Method/Wrapped.pm line 162
Class::MOP::Method::Wrapped::_ANON_('MusicBrainz::Server=HASH(0xc49b208)') called at lib/MusicBrainz/Server.pm line 362
Class::MOP::Class:::around('CODE(0x9cf0d50)', 'MusicBrainz::Server=HASH(0xc49b208)') called at local/lib/perl5/x86_64-linux-gnu-thread-multi/Class/MOP/Method/Wrapped.pm line 162
Class::MOP::Method::Wrapped::_ANON_('MusicBrainz::Server=HASH(0xc49b208)') called at local/lib/perl5/x86_64-linux-gnu-thread-multi/Class/MOP/Method/Wrapped.pm line 35
Class::MOP::Method::Wrapped::_ANON_('MusicBrainz::Server=HASH(0xc49b208)') called at local/lib/perl5/x86_64-linux-gnu-thread-multi/Class/MOP/Method/Wrapped.pm line 91
MusicBrainz::Server::dispatch('MusicBrainz::Server=HASH(0xc49b208)') called at local/lib/perl5/Catalyst.pm line 1968
Catalyst::_ANON_() called at local/lib/perl5/Try/Tiny.pm line 76
eval

{...}

called at local/lib/perl5/Try/Tiny.pm line 67
Try::Tiny::try('CODE(0xc7d9560)', 'Try::Tiny::Catch=REF(0xc6fec70)') called at local/lib/perl5/Catalyst.pm line 1974
Catalyst::handle_request('MusicBrainz::Server', 'env', 'HASH(0xc7e3180)', 'response_cb', 'CODE(0xc735638)') called at local/lib/perl5/Catalyst/Plugin/AutoRestart.pm line 117
Catalyst::Plugin::AutoRestart::handle_request('MusicBrainz::Server', 'env', 'HASH(0xc7e3180)', 'response_cb', 'CODE(0xc735638)') called at local/lib/perl5/Catalyst/Engine.pm line 688
Catalyst::Engine::_ANON_('CODE(0xc735638)') called at local/lib/perl5/Plack/Handler/FCGI.pm line 130
Plack::Handler::FCGI::run('Plack::Handler::FCGI=HASH(0xf549d0)', 'CODE(0x31b3680)') called at local/lib/perl5/Plack/Loader.pm line 84
Plack::Loader::run('Plack::Loader=HASH(0xe7bc90)', 'Plack::Handler::FCGI=HASH(0xf549d0)') called at local/lib/perl5/Plack/Runner.pm line 267
Plack::Runner::run('Plack::Runner=HASH(0xd04808)') called at local/bin/plackup line 10
"
Stack trace:
line 18 MusicBrainz::Server::View::Default
line 303 MusicBrainz::Server
line 295 MusicBrainz::Server
line 304 MusicBrainz::Server
line 317 MusicBrainz::Server
line 362 MusicBrainz::Server
Request data:

$VAR1 = {
'query_parameters' => {},
'body_parameters' => {
'artist_credit.names.0.name' => "Atli \x

{d6}rvarsson",
'packaging_id' => '1',
'date.month' => '1',
'release_group_id' => '',
'labels.0.catalog_number' => 'LLLCD 1241',
'wizard_page_id' => '0',
'release_group.name' => '',
'artist_credit.names.0.artist.id' => '506941',
'labels.0.deleted' => '0',
'country_id' => '222',
'primary_type_id' => '1',
'labels.0.name' => "La\x{2010}La Land Records",
'date.year' => '2013',
'id' => '',
'script_id' => '28',
'status_id' => '1',
'step_tracklist' => 'Tracklist',
'date.day' => '29',
'secondary_type_ids' => '2',
'name' => 'Hansel & Gretel: Witch Hunters',
'barcode' => '',
'artist_credit.names.0.join_phrase' => '',
'labels.0.label_id' => '6864',
'wizard_session_id' => '4861',
'language_id' => '120',
'comment' => '',
'gc-mode' => 'English',
'artist_credit.names.0.artist.name' => "Atli \x{d6}

rvarsson",
'annotation' => ''
}
};

URL: http://musicbrainz.org/release/add

2nd try on exactly same way:

Caught exception in MusicBrainz::Server::Controller::ReleaseEditor::Add->add "Can't use an undefined value as an ARRAY reference at lib/MusicBrainz/Server/Edit/Utils.pm line 165."
Stack trace:
line 165 MusicBrainz::Server::Edit::Utils
line 53 MusicBrainz::Server::Wizard::ReleaseEditor::Add
line 163 MusicBrainz::Server::Wizard::ReleaseEditor::Add
line 168 MusicBrainz::Server::Wizard
line 401 MusicBrainz::Server::Wizard
line 132 MusicBrainz::Server::Wizard
line 92 MusicBrainz::Server::Wizard::ReleaseEditor
line 23 MusicBrainz::Server::Controller::ReleaseEditor::Add
line 303 MusicBrainz::Server
line 295 MusicBrainz::Server
line 304 MusicBrainz::Server
line 317 MusicBrainz::Server
line 362 MusicBrainz::Server
Request data:

$VAR1 = {
'query_parameters' => {},
'body_parameters' => {
'artist_credit.names.0.name' => "Atli \x

{d6}rvarsson",
'packaging_id' => '1',
'date.month' => '1',
'release_group_id' => '',
'labels.0.catalog_number' => 'LLLCD 1241',
'wizard_page_id' => '0',
'release_group.name' => '',
'artist_credit.names.0.artist.id' => '506941',
'labels.0.deleted' => '0',
'country_id' => '222',
'primary_type_id' => '1',
'labels.0.name' => "La\x{2010}La Land Records",
'date.year' => '2013',
'id' => '',
'script_id' => '28',
'status_id' => '1',
'step_tracklist' => 'Tracklist',
'date.day' => '29',
'secondary_type_ids' => '2',
'name' => 'Hansel & Gretel: Witch Hunters',
'barcode' => '',
'artist_credit.names.0.join_phrase' => '',
'labels.0.label_id' => '6864',
'wizard_session_id' => '4863',
'language_id' => '120',
'comment' => '',
'gc-mode' => 'English',
'artist_credit.names.0.artist.name' => "Atli \x{d6}

rvarsson",
'annotation' => ''
}
};

3rd try did let me edit tracks and all was fine until filling edit note and finally trying to add the release:

Caught exception in MusicBrainz::Server::Controller::ReleaseEditor::Add->add "Can't use an undefined value as a HASH reference at lib/MusicBrainz/Server/Wizard.pm line 268."
Stack trace:
line 268 MusicBrainz::Server::Wizard
line 855 MusicBrainz::Server::Wizard::ReleaseEditor
line 94 MusicBrainz::Server::Wizard::ReleaseEditor
line 23 MusicBrainz::Server::Controller::ReleaseEditor::Add
line 303 MusicBrainz::Server
line 295 MusicBrainz::Server
line 304 MusicBrainz::Server
line 317 MusicBrainz::Server
line 362 MusicBrainz::Server
Request data:

$VAR1 = {
'query_parameters' => {},
'body_parameters' =>

{ 'save' => 'Enter edit', 'wizard_page_id' => '5', 'edit_note' => 'http://www.lalalandrecords.com/HandG.html http://soundtrackcollector.com/title/98979/Hansel+%26+Gretel%3A+Witch+Hunters#62960', 'id' => '', 'as_auto_editor' => '1', 'wizard_session_id' => '4868' }

};