Redmine

I'm getting the following trying to open certain issues - it seems to happen more often if there is a euro sign in the description

ActionView::Template::Error (incompatible character encodings: UTF-8 and ASCII-8BIT):
    55:         <%= yield :sidebar %>
    56:         <%= view_layouts_base_sidebar_hook_response %>
    57:     </div>
    58:
    59:     <div id="content">
    60:         <%= render_flash_messages %>
    61:         <%= yield %>
  app/views/layouts/base.html.erb:58:in `_app_views_layouts_base_html_erb__3047165055450172641_66897220'
  app/controllers/issues_controller.rb:119:in `block (2 levels) in show'
  app/controllers/issues_controller.rb:116:in `show'

About your application's environment
Ruby version 1.9.2 (x86_64-linux)
RubyGems version 1.3.7
Rack version 1.4
Rails version 3.2.13
Active Record version 3.2.13
Action Pack version 3.2.13
Active Resource version 3.2.13
Action Mailer version 3.2.13
Active Support version 3.2.13
Middleware Rack::Cache, ActionDispatch::Static, Rack::Lock, #<ActiveSupport::Cache::Strategy::LocalCache::Middleware:0x00000004f2cc28>, Rack::Runtime, Rack::MethodOverride, ActionDispatch::RequestId, Rails::Rack::Logger, ActionDispatch::ShowExceptions, ActionDispatch::DebugExceptions, ActionDispatch::RemoteIp, ActionDispatch::Callbacks, ActiveRecord::ConnectionAdapters::ConnectionManagement, ActiveRecord::QueryCache, ActionDispatch::Cookies, ActionDispatch::Session::CookieStore, ActionDispatch::Flash, ActionDispatch::ParamsParser, ActionDispatch::Head, Rack::ConditionalGet, Rack::ETag, ActionDispatch::BestStandardsSupport, OpenIdAuthentication
Application root /srv/redmine.fwm.cx
Environment production
Database adapter mysql
Database schema version 20130217094251