Redmine

Hello,

I migrated my Redmine installation from 1.4.4 to 2.3.1 without any problems.
Now I wanted to install some plugins (i.e. redmine_charts2, RedminePlannerPlugIn) and I always
run into the same error: installing and migrating the plugin is working fine,
but if I activate the module in a project, I get a "Page not found" error.

production.log:

Started GET "/redmine/projects/20121011_7017023?jump=overview" for 127.0.0.1 at 2013-05-31 14:59:19 +0200
Processing by ProjectsController#show as HTML
Parameters: {"jump"=>"overview", "id"=>"20121011_7017023"}
Current user: k0913632 (id=16)
Redirected to http://127.0.0.1:8080/redmine/projects/20121011_7017023
Completed 302 Found in 30ms (ActiveRecord: 20.0ms)
Started GET "/redmine/projects/20121011_7017023" for 127.0.0.1 at 2013-05-31 14:59:19 +0200
Processing by ProjectsController#show as HTML
Parameters: {"id"=>"20121011_7017023"}
Current user: k0913632 (id=16)
Rendered projects/_members_box.html.erb (20.0ms)
Rendered projects/show.html.erb within layouts/base (30.0ms)
Completed 500 Internal Server Error in 330ms

ActionController::RoutingError (No route matches {:project_id=>#<Project id: 236, name: "XXXX", description: "XXXXX", homepage: "", is_public: true, parent_id: 292, created_on: "2012-10-23 06:25:02", updated_on: "2013-05-16 05:26:38", identifier: "20121011_7017023", status: 1, lft: 71, rgt: 84, inherit_members: false>, :controller=>"charts_burndown2"}):
lib/redmine/menu_manager.rb:150:in `render_single_menu_node'
lib/redmine/menu_manager.rb:102:in `render_menu_node'
lib/redmine/menu_manager.rb:91:in `block in render_menu'
lib/redmine/menu_manager.rb:168:in `block in menu_items_for'
lib/redmine/menu_manager.rb:165:in `each'
lib/redmine/menu_manager.rb:165:in `menu_items_for'
lib/redmine/menu_manager.rb:90:in `render_menu'
lib/redmine/menu_manager.rb:80:in `render_main_menu'
app/views/layouts/base.html.erb:45:in `_app_views_layouts_base_html_erb___960701432_26690640'
app/controllers/projects_controller.rb:163:in `show'

Has anyone any idea what I am missing?