Dashing start problem

I’m trying to start the openhab dashing project, but I’m still having the same error. When I try the dashing with the sample project everything starts perfect, but not with the OpenHab project.

user@server:~/dashboard$ dashing start
/usr/local/lib/ruby/gems/2.0.0/gems/backports-3.6.7/lib/backports/std_lib.rb:9:in require': cannot load such file -- data_mapper (LoadError) from /usr/local/lib/ruby/gems/2.0.0/gems/backports-3.6.7/lib/backports/std_lib.rb:9:inrequire_with_backports’
from /home/jopo/dashboard/lib/settings.rb:1:in <top (required)>' from /usr/local/lib/ruby/gems/2.0.0/gems/backports-3.6.7/lib/backports/std_lib.rb:9:inrequire’
from /usr/local/lib/ruby/gems/2.0.0/gems/backports-3.6.7/lib/backports/std_lib.rb:9:in require_with_backports' from /usr/local/lib/ruby/gems/2.0.0/gems/dashing-1.3.4/lib/dashing/app.rb:157:inblock in require_glob’
from /usr/local/lib/ruby/gems/2.0.0/gems/dashing-1.3.4/lib/dashing/app.rb:156:in each' from /usr/local/lib/ruby/gems/2.0.0/gems/dashing-1.3.4/lib/dashing/app.rb:156:inrequire_glob’
from /usr/local/lib/ruby/gems/2.0.0/gems/dashing-1.3.4/lib/dashing/app.rb:166:in <top (required)>' from /usr/local/lib/ruby/gems/2.0.0/gems/dashing-1.3.4/lib/dashing.rb:3:inrequire’
from /usr/local/lib/ruby/gems/2.0.0/gems/dashing-1.3.4/lib/dashing.rb:3:in <top (required)>' from config.ru:1:inrequire’
from config.ru:1:in block in <main>' from /usr/local/lib/ruby/gems/2.0.0/gems/rack-1.5.5/lib/rack/builder.rb:55:ininstance_eval’
from /usr/local/lib/ruby/gems/2.0.0/gems/rack-1.5.5/lib/rack/builder.rb:55:in initialize' from config.ru:1:innew’
from config.ru:1:in <main>' from /usr/local/lib/ruby/gems/2.0.0/gems/thin-1.6.4/lib/rack/adapter/loader.rb:33:ineval’
from /usr/local/lib/ruby/gems/2.0.0/gems/thin-1.6.4/lib/rack/adapter/loader.rb:33:in load' from /usr/local/lib/ruby/gems/2.0.0/gems/thin-1.6.4/lib/thin/controllers/controller.rb:182:inload_rackup_config’
from /usr/local/lib/ruby/gems/2.0.0/gems/thin-1.6.4/lib/thin/controllers/controller.rb:72:in start' from /usr/local/lib/ruby/gems/2.0.0/gems/thin-1.6.4/lib/thin/runner.rb:200:inrun_command’
from /usr/local/lib/ruby/gems/2.0.0/gems/thin-1.6.4/lib/thin/runner.rb:156:in run!' from /usr/local/lib/ruby/gems/2.0.0/gems/thin-1.6.4/bin/thin:6:in<top (required)>'
from /usr/local/bin/thin:23:in load' from /usr/local/bin/thin:23:in