diff -r 7568f5c1c801 -r 292331e906d7 mercurial/bundle2.py
--- a/mercurial/bundle2.py	Wed May 28 15:31:05 2014 -0700
+++ b/mercurial/bundle2.py	Tue May 27 10:32:07 2014 -0700
@@ -828,9 +828,9 @@
     """Used to transmit abort error over the wire"""
     raise util.Abort(inpart.params['message'], hint=inpart.params.get('hint'))
 
-@parthandler('b2x:error:unknownpart')
+@parthandler('b2x:error:unsupportedcontent')
 def handlereplycaps(op, inpart):
-    """Used to transmit unknown part error over the wire"""
+    """Used to transmit unknown content error over the wire"""
     raise error.BundleValueError(inpart.params['parttype'])
 
 @parthandler('b2x:error:pushraced')