Wiki Server Error

After updating my lion server to Lion Sever Update 1.7.2. I can't enter the wiki page in my browser. Error show like this

ArgumentError in People#show

Showing /usr/share/collabd/coreclient/app/views/cc/_entity_header.html.erb where line #7 raised:

invalid value for Integer: "6.5"

Extracted source (around line #7):

4:           <h1 class="title selectable" title="<%= @entity.longName %>"><%= @entity.longName %></h1>5:           <h2 class="chrome">6:                <%= t("entity.last_modified", {7:                     :time => localized_datetime(@entity.updateTime),8:                     :user => link_to_user(@entity.updatedByUser)9:                }).html_safe %>10:           </h2>

Trace of template inclusion: app/views/people/show.html.erb

Rails.root: /usr/share/collabd/coreclient

Application Trace | Framework Trace | Full Trace

app/helpers/application_helper.rb:92:in `Integer'app/helpers/application_helper.rb:92:in `get_timezone_offset_from_request'app/helpers/application_helper.rb:148:in `localized_datetime'app/views/cc/_entity_header.html.erb:7:in `_app_views_cc__entity_header_html_erb__1774666155_2278391180_4103390'vendor/bundle/ruby/1.8/gems/actionpack-3.0.4/lib/action_view/template.rb:135:in `send'vendor/bundle/ruby/1.8/gems/actionpack-3.0.4/lib/action_view/template.rb:135:in `render'vendor/bundle/ruby/1.8/gems/activesupport-3.0.4

............

Please help me to solve this problem