Dear openproject community,
I upgraded to openproject version 6 today and cannot access openproject through the browser anymore, hitting a 500 internal server error. The server is running RHEL 6 and I updated via yum by changing the baseversion in /etc/yum.repos.d/openproject.repo to stable.6. Openproject appears to be running on the server:

 status openproject
openproject start/running 

During configuration (sudo openproject configure) I received a number of deprecation warnings (see the end of this message). Looking in production.log it seems that I am also missing the openproject/config/plugins directory:

 W, [2016-11-11T15:06:18.212177 #15766]  WARN -- : [auth_saml] Missing settings from '/opt/openproject/config/plugins/auth_saml/settings.yml', skipping omniauth registration. 

I have tried to reconfigure without success either.

Unfortunately I am at a bit of a loss for how to probe further to try and diagnose what could be going on. I have backups of the mysql database, attachments, git repositories etc and backed up the entire server last night (most of it anyway - unfortunately /var/log is not there).
I would be hugely grateful if someone could advise on some next steps to either point me in the direction of the source of this error, how to roll back to version 5, and/or any important information regarding restoring from a backup.

I have considered using yum rollback or uninstalling and reinstalling openproject, but am aware that I am now in somewhat of a panic mode and feel it may be best to take a breath and seek advice before digging any deeper holes! The production.log, web-1.log and worker-1.log files are attached in case this may shed more light on the problem.

Best,
Melrose

DEPRECATION WARNING: alias_method_chain is deprecated. Please, use Module#prepend instead. From module, you can access the original method using super. (called from <top (required)> at /opt/openproject/vendor/bundle/ruby/2.3.0/bundler/gems/omniauth-openid-connect-c3bce4c9e9ac/lib/omniauth/strategies/openid_connect.rb:4)
DEPRECATION WARNING: alias_method_chain is deprecated. Please, use Module#prepend instead. From module, you can access the original method using super. (called from <top (required)> at /opt/openproject/vendor/bundle/ruby/2.3.0/bundler/gems/omniauth-openid-connect-c3bce4c9e9ac/lib/omniauth/strategies/openid_connect.rb:4)
DEPRECATION WARNING: alias_method_chain is deprecated. Please, use Module#prepend instead. From module, you can access the original method using super. (called from <top (required)> at /opt/openproject/vendor/bundle/ruby/2.3.0/bundler/gems/omniauth-openid-connect-c3bce4c9e9ac/lib/omniauth/strategies/openid_connect.rb:4)
DEPRECATION WARNING: alias_method_chain is deprecated. Please, use Module#prepend instead. From module, you can access the original method using super. (called from <top (required)> at /opt/openproject/vendor/bundle/ruby/2.3.0/bundler/gems/omniauth-openid-connect-c3bce4c9e9ac/lib/omniauth/strategies/openid_connect.rb:4)
DEPRECATION WARNING: alias_method_chain is deprecated. Please, use Module#prepend instead. From module, you can access the original method using super. (called from <top (required)> at /opt/openproject/vendor/bundle/ruby/2.3.0/bundler/gems/omniauth-openid-connect-c3bce4c9e9ac/lib/omniauth/strategies/openid_connect.rb:4)
DEPRECATION WARNING: alias_method_chain is deprecated. Please, use Module#prepend instead. From module, you can access the original method using super. (called from <top (required)> at /opt/openproject/vendor/bundle/ruby/2.3.0/bundler/gems/omniauth-openid-connect-c3bce4c9e9ac/lib/omniauth/strategies/openid_connect.rb:4)
DEPRECATION WARNING: alias_method_chain is deprecated. Please, use Module#prepend instead. From module, you can access the original method using super. (called from <top (required)> at /opt/openproject/vendor/bundle/ruby/2.3.0/bundler/gems/omniauth-openid-connect-c3bce4c9e9ac/lib/omniauth/strategies/openid_connect.rb:4)
DEPRECATION WARNING: alias_method_chain is deprecated. Please, use Module#prepend instead. From module, you can access the original method using super. (called from <top (required)> at /opt/openproject/vendor/bundle/ruby/2.3.0/bundler/gems/omniauth-openid-connect-c3bce4c9e9ac/lib/omniauth/strategies/openid_connect.rb:4)
DEPRECATION WARNING: alias_method_chain is deprecated. Please, use Module#prepend instead. From module, you can access the original method using super. (called from <top (required)> at /opt/openproject/vendor/bundle/ruby/2.3.0/bundler/gems/omniauth-openid-connect-c3bce4c9e9ac/lib/omniauth/strategies/openid_connect.rb:4)
DEPRECATION WARNING: alias_method_chain is deprecated. Please, use Module#prepend instead. From module, you can access the original method using super. (called from <top (required)> at /opt/openproject/vendor/bundle/ruby/2.3.0/bundler/gems/omniauth-openid-connect-c3bce4c9e9ac/lib/omniauth/strategies/openid_connect.rb:4)
DEPRECATION WARNING: alias_method_chain is deprecated. Please, use Module#prepend instead. From module, you can access the original method using super. (called from <top (required)> at /opt/openproject/vendor/bundle/ruby/2.3.0/bundler/gems/omniauth-openid-connect-c3bce4c9e9ac/lib/omniauth/strategies/openid_connect.rb:4)
DEPRECATION WARNING: alias_method_chain is deprecated. Please, use Module#prepend instead. From module, you can access the original method using super. (called from <top (required)> at /opt/openproject/vendor/bundle/ruby/2.3.0/bundler/gems/omniauth-openid-connect-c3bce4c9e9ac/lib/omniauth/strategies/openid_connect.rb:4)
DEPRECATION WARNING: alias_method_chain is deprecated. Please, use Module#prepend instead. From module, you can access the original method using super. (called from <top (required)> at /opt/openproject/vendor/bundle/ruby/2.3.0/bundler/gems/omniauth-openid-connect-c3bce4c9e9ac/lib/omniauth/strategies/openid_connect.rb:4)
DEPRECATION WARNING: alias_method_chain is deprecated. Please, use Module#prepend instead. From module, you can access the original method using super. (called from <top (required)> at /opt/openproject/vendor/bundle/ruby/2.3.0/bundler/gems/omniauth-openid-connect-c3bce4c9e9ac/lib/omniauth/strategies/openid_connect.rb:4)
DEPRECATION WARNING: alias_method_chain is deprecated. Please, use Module#prepend instead. From module, you can access the original method using super. (called from <top (required)> at /opt/openproject/vendor/bundle/ruby/2.3.0/bundler/gems/omniauth-openid-connect-c3bce4c9e9ac/lib/omniauth/strategies/openid_connect.rb:4)
DEPRECATION WARNING: alias_method_chain is deprecated. Please, use Module#prepend instead. From module, you can access the original method using super. (called from <top (required)> at /opt/openproject/vendor/bundle/ruby/2.3.0/bundler/gems/omniauth-openid-connect-c3bce4c9e9ac/lib/omniauth/strategies/openid_connect.rb:4)
DEPRECATION WARNING: alias_method_chain is deprecated. Please, use Module#prepend instead. From module, you can access the original method using super. (called from <top (required)> at /opt/openproject/vendor/bundle/ruby/2.3.0/bundler/gems/omniauth-openid-connect-c3bce4c9e9ac/lib/omniauth/strategies/openid_connect.rb:4)
DEPRECATION WARNING: alias_method_chain is deprecated. Please, use Module#prepend instead. From module, you can access the original method using super. (called from <top (required)> at /opt/openproject/vendor/bundle/ruby/2.3.0/bundler/gems/omniauth-openid-connect-c3bce4c9e9ac/lib/omniauth/strategies/openid_connect.rb:4)
DEPRECATION WARNING: alias_method_chain is deprecated. Please, use Module#prepend instead. From module, you can access the original method using super. (called from <top (required)> at /opt/openproject/vendor/bundle/ruby/2.3.0/bundler/gems/omniauth-openid-connect-c3bce4c9e9ac/lib/omniauth/strategies/openid_connect.rb:4)
DEPRECATION WARNING: alias_method_chain is deprecated. Please, use Module#prepend instead. From module, you can access the original method using super. (called from <top (required)> at /opt/openproject/vendor/bundle/ruby/2.3.0/bundler/gems/omniauth-openid-connect-c3bce4c9e9ac/lib/omniauth/strategies/openid_connect.rb:4)
DEPRECATION WARNING: alias_method_chain is deprecated. Please, use Module#prepend instead. From module, you can access the original method using super. (called from <top (required)> at /opt/openproject/vendor/bundle/ruby/2.3.0/bundler/gems/omniauth-openid-connect-c3bce4c9e9ac/lib/omniauth/strategies/openid_connect.rb:4)
DEPRECATION WARNING: alias_method_chain is deprecated. Please, use Module#prepend instead. From module, you can access the original method using super. (called from <top (required)> at /opt/openproject/vendor/bundle/ruby/2.3.0/bundler/gems/omniauth-openid-connect-c3bce4c9e9ac/lib/omniauth/strategies/openid_connect.rb:4)
DEPRECATION WARNING: alias_method_chain is deprecated. Please, use Module#prepend instead. From module, you can access the original method using super. (called from <top (required)> at /opt/openproject/vendor/bundle/ruby/2.3.0/bundler/gems/omniauth-openid-connect-c3bce4c9e9ac/lib/omniauth/strategies/openid_connect.rb:4)
DEPRECATION WARNING: alias_method_chain is deprecated. Please, use Module#prepend instead. From module, you can access the original method using super. (called from <top (required)> at /opt/openproject/vendor/bundle/ruby/2.3.0/bundler/gems/omniauth-openid-connect-c3bce4c9e9ac/lib/omniauth/strategies/openid_connect.rb:4)
*** Seeding for locale: 'en'
*** Seeding basic data
 ↳ BuiltinRolesSeeder
   *** Skipping built in role Non member - already exists
   *** Skipping built in role Anonymous - already exists
 ↳ RoleSeeder
   *** Skipping roles as there are already some configured
 ↳ ActivitySeeder
   *** Skipping activities as there are already some configured
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   *** Skipping colors as there are already some configured
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   *** Skipping types, statuses and workflows as there are already some configured
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 ↳ ProjectTypeSeeder
   *** Skipping project types as there are already some configured
 ↳ SettingSeeder
   *** Skipping settings as all settings already exist in the db
   Loading discovered seeders: 
 ↳ EnumerationsSeeder
 ↳ SettingSeeder
   *** Skipping BasicData::Backlogs::SettingSeeder
*** Seeding admin user
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*** Seeding demo data
 ↳ ProjectSeeder
   *** Skipping DemoData::ProjectSeeder
*** Loading action_cable_engine seed data
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SCM vendor Subversion uses remote managed repositories. Skipping.
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This job runs via upstart, invoking upstart now...