Redmine

I had installed redmine 2.5 with ruby 2.2.2 , it is successfully installed but when i click on users or create any projcets it gives error as internal server error

ActionView::Template::Error (undefined method `name' for nil:NilClass):
8: ) >
9: </p>
10: <= content_tag 'div', :id => 'notified-projects', :style => (@user.mail_notification == 'selected' ? '' : 'display:none;') do >
11: <= render_project_nested_lists(@user.projects) do |project|
12: content_tag('label',
13: check_box_tag(
14: 'user[notified_project_ids][]',
app/helpers/application_helper.rb:258:in `render_project_nested_lists'
app/views/users/_mail_notifications.html.erb:11:in `block in app_views_users_mail_notifications_html_erb___198177133578381805_69992840063240'
app/views/users/_mail_notifications.html.erb:10:in `_app_views_users__mail_notifications_html_erb___198177133578381805_69992840063240'
app/views/users/_form.html.erb:45:in `_app_views_users__form_html_erb___2472432516782750213_69992839846340'
app/views/users/new.html.erb:4:in `block in app_views_users_new_html_erb_3129598378476235556_69992839771620'
app/helpers/application_helper.rb:1041:in `labelled_form_for'
app/views/users/new.html.erb:3:in `_app_views_users_new_html_erb__3129598378476235556_69992839771620'