Redmine

I created a new project. when i took the setting tab its showing an internal server error.But the rest of other projects are working fine

Please help me its urgent

ERROR LOG IS:

Processing ProjectsController#settings (for xxx.xxx.xx.xx at 2013-02-01 10:30:11) [GET]
Parameters: {"controller"=>"projects", "id"=>"nbmdkenotn", "action"=>"settings"}
Rendering template within layouts/base
Rendering projects/settings

ActionView::TemplateError (undefined method `days' for nil:NilClass) on line #15 of app/views/projects/settings/_versions.html.erb:
12: <tbody>
13: <% for version in @project.shared_versions.sort >
14: <tr class="version <= cycle 'odd', 'even' > <=h version.status > <= 'shared' if version.project != Herve Harster >">
15: <td class="name"><= link_to_version version ></td>
16: <td class="date"><= format_date(version.effective_date) ></td>
17: <td class="description"><=h version.description ></td>
18: <td class="status"><= l("version_status_#{version.status}") %></td>

vendor/plugins/redmine_milestones/app/models/milestone.rb:133:in `start_date'
vendor/plugins/redmine_milestones/app/models/milestone.rb:71:in `active_for_version'
vendor/plugins/redmine_milestones/app/models/milestone.rb:71:in `active_for_version'
app/views/projects/settings/_versions.html.erb:15
app/views/projects/settings/_versions.html.erb:13:in `each'
app/views/projects/settings/_versions.html.erb:13
app/views/common/_tabs.html.erb:24
app/views/common/_tabs.html.erb:23:in `each'
app/views/common/_tabs.html.erb:23
app/helpers/application_helper.rb:222:in `render_tabs'
app/views/projects/settings.html.erb:3
passenger (3.0.11) lib/phusion_passenger/rack/request_handler.rb:96:in `process_request'
passenger (3.0.11) lib/phusion_passenger/abstract_request_handler.rb:513:in `accept_and_process_next_request'
passenger (3.0.11) lib/phusion_passenger/abstract_request_handler.rb:274:in `main_loop'
passenger (3.0.11) lib/phusion_passenger/classic_rails/application_spawner.rb:321:in `start_request_handler'
passenger (3.0.11) lib/phusion_passenger/classic_rails/application_spawner.rb:275:in `send'
passenger (3.0.11) lib/phusion_passenger/classic_rails/application_spawner.rb:275:in `handle_spawn_application'
passenger (3.0.11) lib/phusion_passenger/utils.rb:479:in `safe_fork'
passenger (3.0.11) lib/phusion_passenger/classic_rails/application_spawner.rb:270:in `handle_spawn_application'
passenger (3.0.11) lib/phusion_passenger/classic_rails/application_spawner.rb:270:in `handle_spawn_application'
passenger (3.0.11) lib/phusion_passenger/abstract_server.rb:357:in `__send__'
passenger (3.0.11) lib/phusion_passenger/abstract_server.rb:357:in `server_main_loop'
passenger (3.0.11) lib/phusion_passenger/abstract_server.rb:206:in `start_synchronously'
passenger (3.0.11) lib/phusion_passenger/abstract_server.rb:180:in `start'
passenger (3.0.11) lib/phusion_passenger/classic_rails/application_spawner.rb:149:in `start'
passenger (3.0.11) lib/phusion_passenger/spawn_manager.rb:219:in `spawn_rails_application'
passenger (3.0.11) lib/phusion_passenger/abstract_server_collection.rb:132:in `lookup_or_add'
passenger (3.0.11) lib/phusion_passenger/spawn_manager.rb:214:in `spawn_rails_application'
passenger (3.0.11) lib/phusion_passenger/abstract_server_collection.rb:82:in `synchronize'
passenger (3.0.11) lib/phusion_passenger/abstract_server_collection.rb:79:in `synchronize'
passenger (3.0.11) lib/phusion_passenger/spawn_manager.rb:213:in `spawn_rails_application'
passenger (3.0.11) lib/phusion_passenger/spawn_manager.rb:132:in `spawn_application'
passenger (3.0.11) lib/phusion_passenger/spawn_manager.rb:275:in `handle_spawn_application'
passenger (3.0.11) lib/phusion_passenger/abstract_server.rb:357:in `__send__'
passenger (3.0.11) lib/phusion_passenger/abstract_server.rb:357:in `server_main_loop'
passenger (3.0.11) lib/phusion_passenger/abstract_server.rb:206:in `start_synchronously'
passenger (3.0.11) lib/phusion_passenger/abstract_server.rb:180:in `start'
passenger (3.0.11) lib/phusion_passenger/classic_rails/application_spawner.rb:149:in `start'
passenger (3.0.11) lib/phusion_passenger/spawn_manager.rb:219:in `spawn_rails_application'
passenger (3.0.11) lib/phusion_passenger/abstract_server_collection.rb:132:in `lookup_or_add'
passenger (3.0.11) lib/phusion_passenger/spawn_manager.rb:214:in `spawn_rails_application'
passenger (3.0.11) lib/phusion_passenger/abstract_server_collection.rb:82:in `synchronize'
passenger (3.0.11) lib/phusion_passenger/abstract_server_collection.rb:79:in `synchronize'
passenger (3.0.11) lib/phusion_passenger/spawn_manager.rb:213:in `spawn_rails_application'
passenger (3.0.11) lib/phusion_passenger/spawn_manager.rb:132:in `spawn_application'
passenger (3.0.11) lib/phusion_passenger/spawn_manager.rb:275:in `handle_spawn_application'
passenger (3.0.11) lib/phusion_passenger/abstract_server.rb:357:in `__send__'
passenger (3.0.11) lib/phusion_passenger/abstract_server.rb:357:in `server_main_loop'
passenger (3.0.11) lib/phusion_passenger/abstract_server.rb:206:in `start_synchronously'
passenger (3.0.11) helper-scripts/passenger-spawn-server:99

Rendering /mnt/redmine/home/redmine/redmine/public/500.html (500 Internal Server Error)

Thanks