sugar-moon is currently broken in rawhide, as it depends on python-json, which is broken under Python 2.6. Luckily, upstream has already switched to using the json module that comes with Python 2.6 in their latest release (version 10), so this can be fixed by updating the package and dropping the python-json dependency.
As a side note, on Fedora 10 and below, sugar-moon falls back to using simplejson, so the python-json dependency would need to be replaced with python-simplejson in those releases.
sugar-moon-10-1.fc11 has been submitted as an update for Fedora 11. http://admin.fedoraproject.org/updates/sugar-moon-10-1.fc11
This bug appears to have been reported against 'rawhide' during the Fedora 11 development cycle. Changing version to '11'. More information and reason for this action is here: http://fedoraproject.org/wiki/BugZappers/HouseKeeping
sugar-moon-10-1.fc11 has been pushed to the Fedora 11 testing repository. If problems still persist, please make note of it in this bug report. If you want to test the update, you can install it with su -c 'yum --enablerepo=updates-testing update sugar-moon'. You can provide feedback for this update here: http://admin.fedoraproject.org/updates/F11/FEDORA-2009-6460
sugar-moon-10-1.fc11 has been pushed to the Fedora 11 stable repository. If problems still persist, please make note of it in this bug report.