error in converting from svn

[hg user]

I just updated to 1.4.2 to see if the problem disappeared but it did not....

I'm converting a svn project hosted on sourceforge... it took more than 2
days to reach this commit that gives error... so if some developer needs to
download this repository I can put it somewhere for download.

Thank you
Francesco

hg convert harbour-project
assuming destination harbour-project-hg
scanning source...
sorting...
converting...
5519 2007-10-21 02:52 UTC+0100 Viktor Szakats (harbour.01 syenar.hu)
transaction abort!
rollback completed
** unknown exception encountered, details follow
** report bug details to http://mercurial.selenic.com/bts/
** or mercurial at selenic.com
** Mercurial Distributed SCM (version 1.4.2)
** Extensions loaded: convert, graphlog
Traceback (most recent call last):
  File "/usr/bin/hg", line 5, in <module>
    pkg_resources.run_script('mercurial==1.4.2', 'hg')
  File
"/usr/lib64/python2.6/site-packages/setuptools-0.6c9-py2.6.egg/pkg_resources.py",
line 448, in run_script
  File
"/usr/lib64/python2.6/site-packages/setuptools-0.6c9-py2.6.egg/pkg_resources.py",
line 1166, in run_script
  File
"/usr/lib64/python2.6/site-packages/mercurial-1.4.2-py2.6-linux-x86_64.egg/EGG-INFO/scripts/hg",
line 27, in <module>
    mercurial.dispatch.run()
  File
"/usr/lib64/python2.6/site-packages/mercurial-1.4.2-py2.6-linux-x86_64.egg/mercurial/dispatch.py",
line 16, in run
    sys.exit(dispatch(sys.argv[1:]))
  File
"/usr/lib64/python2.6/site-packages/mercurial-1.4.2-py2.6-linux-x86_64.egg/mercurial/dispatch.py",
line 30, in dispatch
    return _runcatch(u, args)
  File
"/usr/lib64/python2.6/site-packages/mercurial-1.4.2-py2.6-linux-x86_64.egg/mercurial/dispatch.py",
line 46, in _runcatch
    return _dispatch(ui, args)
  File
"/usr/lib64/python2.6/site-packages/mercurial-1.4.2-py2.6-linux-x86_64.egg/mercurial/dispatch.py",
line 454, in _dispatch
    return runcommand(lui, repo, cmd, fullargs, ui, options, d)
  File
"/usr/lib64/python2.6/site-packages/mercurial-1.4.2-py2.6-linux-x86_64.egg/mercurial/dispatch.py",
line 324, in runcommand
    ret = _runcommand(ui, options, cmd, d)
  File
"/usr/lib64/python2.6/site-packages/mercurial-1.4.2-py2.6-linux-x86_64.egg/mercurial/dispatch.py",
line 505, in _runcommand
    return checkargs()
  File
"/usr/lib64/python2.6/site-packages/mercurial-1.4.2-py2.6-linux-x86_64.egg/mercurial/dispatch.py",
line 459, in checkargs
    return cmdfunc()
  File
"/usr/lib64/python2.6/site-packages/mercurial-1.4.2-py2.6-linux-x86_64.egg/mercurial/dispatch.py",
line 453, in <lambda>
    d = lambda: util.checksignature(func)(ui, *args, **cmdoptions)
  File
"/usr/lib64/python2.6/site-packages/mercurial-1.4.2-py2.6-linux-x86_64.egg/mercurial/util.py",
line 386, in check
    return func(*args, **kwargs)
  File
"/usr/lib64/python2.6/site-packages/mercurial-1.4.2-py2.6-linux-x86_64.egg/hgext/convert/__init__.py",
line 229, in convert
    return convcmd.convert(ui, src, dest, revmapfile, **opts)
  File
"/usr/lib64/python2.6/site-packages/mercurial-1.4.2-py2.6-linux-x86_64.egg/hgext/convert/convcmd.py",
line 398, in convert
    c.convert(sortmode)
  File
"/usr/lib64/python2.6/site-packages/mercurial-1.4.2-py2.6-linux-x86_64.egg/hgext/convert/convcmd.py",
line 329, in convert
    self.copy(c)
  File
"/usr/lib64/python2.6/site-packages/mercurial-1.4.2-py2.6-linux-x86_64.egg/hgext/convert/convcmd.py",
line 301, in copy
    self.source, self.map)
  File
"/usr/lib64/python2.6/site-packages/mercurial-1.4.2-py2.6-linux-x86_64.egg/hgext/convert/hg.py",
line 166, in putcommit
    self.repo.commitctx(ctx)
  File
"/usr/lib64/python2.6/site-packages/mercurial-1.4.2-py2.6-linux-x86_64.egg/mercurial/localrepo.py",
line 877, in commitctx
    changed)
  File
"/usr/lib64/python2.6/site-packages/mercurial-1.4.2-py2.6-linux-x86_64.egg/mercurial/localrepo.py",
line 723, in _filecommit
    self.ui.debug(" %s: copy %s:%s\n" % (fname, cfname, hex(crev)))
TypeError: b2a_hex() argument 1 must be string or read-only buffer, not None
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