Redmine

I tried to install and load the new ekanban plugin.
When i try to activate it in a projects settings an error occurs when clicking the settings tab:

ActionView::Template::Error (stack level too deep):
  plugins/AgileDwarf/lib/ekanban/redmine_patches.rb:42

Setting the kanban module as default in Administration:Settings:Projects works.
If i create a new project the kanban checkbox appears in the modules tab and is checked.
When i try to save the new project the error mentioned above occurs.

System:

Environment:
  Redmine version                          2.1.3.stable
  Ruby version                             1.9.3 (x86_64-linux)
  Rails version                            3.2.8
  Environment                              production
  Database adapter                         Mysql2
Redmine plugins:
  ekanban                                  0.0.1
  redmine_backlogs                         v0.9.35
  redmine_ckeditor                         0.2.1
  redmine_contacts                         3.0.2-light
  redmine_contacts_expenses                2.0.0-beta-2
  redmine_contacts_invoices                2.0.0-pro
  redmine_dmsf                             1.4.5 stable
  redmine_favourite_projects               0.6
  redmine_jquery_file_upload               0.0.1
  redmine_my_roadmaps                      0.2.9
  redmine_projects_accordion               0.0.2
  redmine_spent_time                       2.4.0
  redmine_wktime                           1.1
  redmine_work_time                        0.2.6