It appears that you've obsoleted conexusmm at some point with conexus.
Please see
https://bugzilla.redhat.com/show_bug.cgi?id=199020#c4 and
https://fedorahosted.org/rel-eng/ticket/1242 to resolve this issue.
--
Jesse Keating
Fedora -- Freedom² is a feature!
identi.ca:
http://identi.ca/jkeating