Redmine

Hello,
Playing move the modules on "my page", is this message appeared:

Internal error
An error occurred on the page you were trying to access.
If you continue to experience problems please contact your Redmine administrator for assistance.
If you are the Redmine administrator, check your log files for details about the error.
Back

Since I am unable to access "..my/Page" or "/my/page_layout". (Only my account is affected.)

log:

Started GET "/my/page" for 127.0.0.1 at 2016-02-12 10:34:56 +0100
Processing by MyController#page as HTML
  Current user: jefbey (id=68)
  Rendered plugins/redmine_contacts/app/views/my/blocks/_my_deals.html.erb (10.2ms)
  Rendered my/page.html.erb within layouts/base (11.3ms)
Completed 500 Internal Server Error in 20ms

ActionView::Template::Error (undefined method `visible' for #<Class:0x000000044bd558>):
    1: <h3><%= l(:label_my_deal_plural) %></h3>
    2:
    3: <% deals = Deal.visible.open.find(:all, :conditions => {:assigned_to_id  => User.current.id}, :limit => 20) %>
    4:
    5: <div class="box" id="duplicates">
    6:  <ul>
  app/views/my/page.html.erb:11:in `block in _app_views_my_page_html_erb___2133875051864950023_66310220'
  app/views/my/page.html.erb:8:in `each'
  app/views/my/page.html.erb:8:in `_app_views_my_page_html_erb___2133875051864950023_66310220'

Thanks in advance