Redmine

Hi anyone,

I 've been stumbled in to this error for a while.
When I accessed the /redmine/project, my browser display "Internal error" with "Redmin 500 error" on the title.

I checked the production.log, here it is:

Started GET "/redmine/projects" for 192.168.1.103 at 2015-05-16 10:56:50 +0000
Processing by ProjectsController#index as HTML
  Current user: admin (id=1)
  Rendered projects/index.html.erb within layouts/base (183.0ms)
Completed 500 Internal Server Error in 202ms (ActiveRecord: 15.2ms)

ActionView::Template::Error (undefined method `closed_pourcent' for #<Version:0xb3da00f8>):
     9: <h2><%= l(:label_project_plural) %></h2>
    10: 
    11: <div id="projects-index">
    12: <%= render_project_hierarchy(@projects) %>
    13: </div>
    14: 
    15: <% if User.current.logged? %>
  app/helpers/application_helper.rb:279:in `block in render_project_nested_lists'
  app/helpers/application_helper.rb:264:in `each'
  app/helpers/application_helper.rb:264:in `render_project_nested_lists'
  app/views/projects/index.html.erb:12:in `_app_views_projects_index_html_erb__1024462673__636547278'

Here is my environment:

Environment:
  Redmine version                3.0.3.stable
  Ruby version                   1.9.3-p484 (2013-11-22) [i686-linux]
  Rails version                  4.2.1
  Environment                    production
  Database adapter               Mysql2
SCM:
  Git                            1.9.1
  Filesystem                     
Redmine plugins:
  progressive_projects_list      1.0.0
  redmine_bootstrap_kit          0.2.3
  redmine_git_hosting            1.0.4
  redmine_spent_time             3.0.1

Could anyone help me with the error?
I 've searched for "closed_pourcent" in this forum, 0 result came up.

Thank you.