Redmine

Hello everybody.

I'm running a Redmine 3.2.1 since a year and I'm doing a painful migration to 3.3.1-0 thru the Bitnami deploy. I'm obliged to do it because of a vulnerability problem and also because I want to change the hosting (from GCloud to my own server).

I did the following :
- Use "mysqldump" to create a full backup of the database
- Use FTP to create a full backup of the files
- Install the new server on Ubuntu
- Check that the new server was running fine by creating test data
- Import the dump file in the new database
- Copy the files to the new server

So far so good but then I run into a problem. The ISSUES and the ROLES were no longer accessible.
To determine the cause of the problem I redid the above procedure with a Windows deploy. I run into exactly the same problem so it's not a deployment issue.

Then I used phpMayAdmin to empty the ROLES table (truncate) and then migrated again (via a dump) from Redmine321 to 331 in the Windows deploy.

The issues are accessible, but unfortunately a problem remains with roles !
There is no roles left (normal) but it's impossible to create new one...
I got that error message and in the production log :

Started GET "/redmine/roles/new" for 127.0.0.1 at 2016-11-06 11:04:11 -0400
Processing by RolesController#new as HTML
  Current user: admin (id=1)
  Rendered roles/_form.html.erb (35.0ms)
  Rendered roles/new.html.erb within layouts/admin (63.0ms)
Completed 500 Internal Server Error in 189ms (ActiveRecord: 84.1ms)

ActionView::Template::Error (undefined method `accessor' for #<ActiveRecord::Type::Value:0xa1ab520>):
    84:         <%= hidden_field_tag "role[permissions_all_trackers][#{permission}]", '0', :id => nil %>
    85:         <%= check_box_tag "role[permissions_all_trackers][#{permission}]",
    86:               '1',
    87:               @role.permissions_all_trackers?(permission),
    88:               :class => "#{permission}_shown",
    89:               :data => {:disables => ".#{permission}_tracker"} %>
    90:       </td>
  app/models/role.rb:213:in `permissions_all_trackers'
  app/models/role.rb:222:in `permissions_all_trackers?'
  app/views/roles/_form.html.erb:87:in `block in _app_views_roles__form_html_erb___176638760_85034556'
  app/views/roles/_form.html.erb:82:in `each'
  app/views/roles/_form.html.erb:82:in `_app_views_roles__form_html_erb___176638760_85034556'
  app/views/roles/new.html.erb:4:in `block in _app_views_roles_new_html_erb___523145053_85020360'
  app/helpers/application_helper.rb:1051:in `labelled_form_for'
  app/views/roles/new.html.erb:3:in `_app_views_roles_new_html_erb___523145053_85020360'
  lib/redmine/sudo_mode.rb:63:in `sudo_mode'

Beside that, deleting all the roles is not a very safe move, so I'd like to keep them of course.
Anybody has an idea of what is going on and how to solve that problem ?
Thanks in advance for your help