Redmine

Sqlite 3
Ruby 1.8.7
Rails 2.3.5

page:

Internal error

An error occurred on the page you were trying to access.
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Processing IssuesController#show (for 10.10.19.2 at 2011-02-09 23:18:30) [GET]
  Parameters: {"action"=>"show", "id"=>"32", "controller"=>"issues"}
Rendering template within layouts/base
Rendering issues/show.rhtml

ActionView::TemplateError (OLE2 signature is invalid) on line #19 of vendor/plugins/redmine_msg_preview/app/views/issues/_msg_list.html.erb:
16:     </tr></thead>
17:     <tbody>
18:   <% @issue.attachments.each do |att| %>
19:       <% msg = Mapi::Msg.open att.diskfile %>
20:     <tr class="<%= cycle("odd", "even") %>">
21:     <td><%= lookup_property(msg, "SENDER") %></td>
22:       <td><%= lookup_property(msg, "SUBJECT") %></td>

    vendor/plugins/redmine_msg_preview/app/views/issues/_msg_list.html.erb:19
    vendor/plugins/redmine_msg_preview/app/views/issues/_msg_list.html.erb:18
    lib/redmine/hook.rb:113:in `send'
    lib/redmine/hook.rb:113:in `view_issues_show_description_bottom'
    lib/redmine/hook.rb:63:in `send'
    lib/redmine/hook.rb:63:in `call_hook'
    lib/redmine/hook.rb:63:in `each'
    lib/redmine/hook.rb:63:in `call_hook'
    lib/redmine/hook.rb:60:in `tap'
    lib/redmine/hook.rb:60:in `call_hook'
    lib/redmine/hook.rb:144:in `call_hook'
    app/views/issues/show.rhtml:63:in `_run_rhtml_app47views47issues47show46rhtml'
    app/controllers/issues_controller.rb:116:in `show'
    app/controllers/issues_controller.rb:115:in `show'
    /usr/lib/ruby/1.8/webrick/httpserver.rb:104:in `service'
    /usr/lib/ruby/1.8/webrick/httpserver.rb:65:in `run'
    /usr/lib/ruby/1.8/webrick/server.rb:173:in `start_thread'
    /usr/lib/ruby/1.8/webrick/server.rb:162:in `start'
    /usr/lib/ruby/1.8/webrick/server.rb:162:in `start_thread'
    /usr/lib/ruby/1.8/webrick/server.rb:95:in `start'
    /usr/lib/ruby/1.8/webrick/server.rb:92:in `each'
    /usr/lib/ruby/1.8/webrick/server.rb:92:in `start'
    /usr/lib/ruby/1.8/webrick/server.rb:23:in `start'
    /usr/lib/ruby/1.8/webrick/server.rb:82:in `start'

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