You are installing Easy Redmine under user with insufficient permissions and not following our strong recommendation in the instructions.
- Correct permissions by commands chgrp and chown according to server settings (eg. chgrp -R www-data public_html)
- Run installation again bundle exec rake easyproject:install RAILS_ENV=production which will clear cache (if you run it by root, it will not be succesful)
- Restart server
If you are using virtual machine provided by Easy Software, run under user easy:
sudo chown -R easy /srv/easyredmine/public_html
sudo chgrp -R easy /srv/easyredmine/public_html
bundle exec rake easyproject:install RAILS_ENV=production
sudo service unicorn restart
Remember to set the permissions for all necessary folders.