Traceback (most recent call last):

 "<stdin>", line 1, in <module>

 "build/bdist.macosx-10.8-x86_64/egg/schema.py", line 150, in validateschema.SchemaError: missed keys set([<type 'str'>])
Traceback (most recent call last):

 "/Users/whodevil/python/khal/lib/python2.7/site-packages/vdirsyncer/cli.py", line 480, in sync_collection
force_delete=status_name in force_delete

 "/Users/whodevil/python/khal/lib/python2.7/site-packages/vdirsyncer/sync.py", line 129, in sync
b_idents = _prepare_idents(storage_b, storage_a, b_href_to_status)

 "/Users/whodevil/python/khal/lib/python2.7/site-packages/vdirsyncer/sync.py", line 66, in _prepare_idents
for href, etag in storage.list():

 "/Users/whodevil/python/khal/lib/python2.7/site-packages/vdirsyncer/storage/dav.py", line 565, in list
for href, etag in self._dav_query(xml):

 "/Users/whodevil/python/khal/lib/python2.7/site-packages/vdirsyncer/storage/dav.py", line 420, in _dav_query
contenttype = prop.find('{DAV:}getcontenttype').textAttributeError: 'NoneType' object has no attribute 'text'