In the Redmine error log, we can see the following:
Started GET "/redmine/" for 127.0.0.1 at 2018-08-08 09:11:59 +0800
Processing by WelcomeController#index as HTML
Completed 500 Internal Server Error in 0ms (ActiveRecord: 0.0ms)
ActiveRecord::StatementInvalid (Mysql2::Error: Unknown column 'updated_on' in 'field list': SELECT MAX(updated_on) FROM `settings`):
Did you install any plugin, or run any Redmine commands before this error happened? Or did it fail right after finishing the installer?
If you installed a plugin, you need to verify that you properly migrated your databases (don't forget to load the console):
bundle exec rake redmine:plugins:migrate RAILS_ENV=production
If the installer did not complete successfully, we recommend you uninstall your Redmine and re-install it again.