GUI doesnt come up with L2 switch

I pulled the latest code of L2switch from github and connected mininet (linear
topology for 6 switches) and confirmed the same are connected to ODL.

After running the following command:
feature:install odl-openflowplugin-all odl-l2switch-all odl-dlux-all

I tried accessing the UI at --> http://localhost:8181/dlux/index.html

It gives 404 error and checked Karaf.log which gives multiple errors while feature installation.