ese-unibe-ch/ese2011-team6 — comment on commit 87cd12c0ee835f4ea7af2f1a86fe9e185ea0338e
File:  line 0
By rstebler:

If the calendar name contains spaces you get a nullpointer ecxeption. And the link redirected to calendar overview if the username contains spaces. should be fixed now in 95ef701.
Hope this fixes your exception as well.