The "+" symbol doesn’t work here and doesn’t allow user to add the respective resource.

The "+" symbol doesn’t work here and doesn’t allow user to add the respective resource.

Steps:
1. Go to : http://next.dev.curriki.org/xwiki/bin/view/Coll_Group_CurrikiGeometry/KhanQuizzes?skin=respurriki
2. Select an exercise
3. Click on the + symbol