The Print option doesn’t work.

The Print option doesn’t work. It results in "Error number 4001 in 4: Error while parsing velocity page Wrapped Exception: Failed to evaluate content with id "

Steps:
1. Go to : http://next.dev.curriki.org/xwiki/bin/view/Coll_Group_CurrikiGeometry/KhanQuizzes?skin=respurriki
2. Select an Exercise
3. Select a Topic
4. Click Print