cubicweb-blog #3825693 Exception: Can't split 'sioccontent' [open]

On http://localhost:8080/blogentry/825?vid=rdf

Traceback:

2014-05-12 15:02:03 - (cubicweb.web) ERROR: Exception(u"Can't split 'sioccontent'",)
Traceback (most recent call last):
File "/usr/lib/python2.7/dist-packages/cubicweb/web/application.py", line 456, in core_handle
  result = controller.publish(rset=rset)
File "/usr/lib/python2.7/dist-packages/cubicweb/web/views/basecontrollers.py", line 136, in publish
  rset=rset, view=view)
File "/usr/lib/python2.7/dist-packages/cubicweb/cwvreg.py", line 398, in main_template
  res = obj.render(**kwargs)
File "/usr/lib/python2.7/dist-packages/cubicweb/view.py", line 137, in render
  view_func(**context)
File "/usr/lib/python2.7/dist-packages/cubicweb/web/views/basetemplates.py", line 115, in call
  view.render()
File "/usr/lib/python2.7/dist-packages/cubicweb/view.py", line 137, in render
  view_func(**context)
File "/usr/lib/python2.7/dist-packages/cubicweb/web/views/rdf.py", line 60, in call
  self.w(graph.serialize().decode('utf-8'))
File "/usr/lib/pymodules/python2.7/rdflib/Graph.py", line 680, in serialize
  return serializer.serialize(destination, base=base, encoding=encoding, **args)
File "/usr/lib/pymodules/python2.7/rdflib/syntax/serializer.py", line 28, in serialize
  self.serializer.serialize(stream, base=base, encoding=encoding, **args)
File "/usr/lib/pymodules/python2.7/rdflib/syntax/serializers/XMLSerializer.py", line 54, in serialize
  bindings = list(self.__bindings())
File "/usr/lib/pymodules/python2.7/rdflib/syntax/serializers/XMLSerializer.py", line 26, in __bindings
  prefix, namespace, name = nm.compute_qname(predicate)
File "/usr/lib/pymodules/python2.7/rdflib/syntax/NamespaceManager.py", line 58, in compute_qname
  namespace, name = split_uri(uri)
File "/usr/lib/pymodules/python2.7/rdflib/syntax/xml_names.py", line 82, in split_uri
  raise Exception("Can't split '%s'" % uri)
Exception: Can't split 'sioccontent'
prioritynormal
typebug
done in<not specified>
closed by<not specified>