Userpreference is missing

internal error

ActionView::Template::Error (undefined method `default_users_hide_mail?' for #<Class:0x007fdda8bd8408>):
    1: <% include_calendar_headers_tags -%>
    2: <% heads_for_wiki_formatter -%>
    3: <head>
    4:   <meta http-equiv="X-UA-Compatible" content="IE=Edge,chrome=1">
    5:   <meta charset="utf-8" />
  app/models/user_preference.rb:29:in `initialize'
  app/models/user.rb:856:in `pref'

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