Pull from 'serve'd repo doesn't work

Run default webserver. Tried to check 'incoming' See log

% hg serve --port 8000 --debug -R W:_MW\mw-x
listening at http://bbbaga:8000/ (bound to *:8000)
10.0.10.86 - - [13/Jul/2011 20:32:32] "GET /?cmd=capabilities HTTP/1.1" 200 -
10.0.10.86 - - [13/Jul/2011 20:32:32] "GET /?cmd=batch HTTP/1.1" 200 - x-hgarg-1:cmds=heads+%3Bknown+nodes%3Dfcb7cb0136ff8c517dc379cc1c295cdb49e423c7
10.0.10.86 - - [13/Jul/2011 20:32:32] "GET /?cmd=getbundle HTTP/1.1" 500 - x-hgarg-1:common=fcb7cb0136ff8c517dc379cc1c295cdb49e423c7&heads=0ecb1c839f0cdf2be34d44e4a86c3de58864eaaa
10.0.10.86 - - [13/Jul/2011 20:32:32] Exception happened during processing request '/?cmd=getbundle':
Traceback (most recent call last):
File "mercurial\hgweb\server.pyo", line 77, in do_POST
File "mercurial\hgweb\server.pyo", line 70, in do_write
File "mercurial\hgweb\server.pyo", line 137, in do_hgweb
File "mercurial\hgweb\hgweb_mod.pyo", line 91, in call
File "mercurial\hgweb\hgweb_mod.pyo", line 127, in run_wsgi
File "mercurial\hgweb\protocol.pyo", line 75, in call
File "mercurial\wireproto.pyo", line 340, in dispatch
File "mercurial\wireproto.pyo", line 439, in getbundle
File "mercurial\localrepo.pyo", line 1500, in getbundle
File "mercurial\localrepo.pyo", line 1515, in _changegroupsubset
File "mercurial\localrepo.pyo", line 1620, in _changegroup
File "mercurial\localrepo.pyo", line 224, in hook
File "mercurial\hook.pyo", line 128, in hook
File "mercurial\windows.pyo", line 30, in getattr
AttributeError: 'Blackhole' object has no attribute 'fileno'