Traceback (most recent call last):
  File "/home/sensei/_workspace/_moin/MercurialBackend/MoinMoin/request/__init__.py", line 1304, in run
    handler(self.page.page_name, self)
  File "/home/sensei/_workspace/_moin/MercurialBackend/MoinMoin/action/edit.py", line 24, in execute
    if not request.user.may.write(pagename):
  File "/home/sensei/_workspace/_moin/MercurialBackend/MoinMoin/security/__init__.py", line 146, in <lambda>
    return lambda pagename: _check(self.request, pagename, self.name, attr)
  File "/home/sensei/_workspace/_moin/MercurialBackend/MoinMoin/security/__init__.py", line 81, in _check
    acl = p.getACL() # this will be fast in a reused page obj
  File "/home/sensei/_workspace/_moin/MercurialBackend/MoinMoin/Page.py", line 511, in getACL
    if self._item is not None: # an item exists
  File "/home/sensei/_workspace/_moin/MercurialBackend/MoinMoin/Page.py", line 159, in get_item
    self.lazy_load()
  File "/home/sensei/_workspace/_moin/MercurialBackend/MoinMoin/Page.py", line 133, in lazy_load
    self.__rev = self.__item.get_revision(self.rev)
  File "/home/sensei/_workspace/_moin/MercurialBackend/MoinMoin/storage/__init__.py", line 516, in get_revision
    return self._backend._get_revision(self, revno)
  File "/home/sensei/_workspace/_moin/MercurialBackend/MoinMoin/storage/backends/hg.py", line 180, in _get_revision
    has, last, changectx = self._has_revision(item, revno)
  File "/home/sensei/_workspace/_moin/MercurialBackend/MoinMoin/storage/backends/hg.py", line 393, in _has_revision
    return True, int(max(revpairs)[0]), self._repo[ctxrev]
  File "/home/sensei/_workspace/hg-moin/mercurial/localrepo.py", line 107, in __getitem__
    return context.changectx(self, changeid)
  File "/home/sensei/_workspace/hg-moin/mercurial/context.py", line 20, in __init__
    self._node = self._repo.lookup(changeid)
  File "/home/sensei/_workspace/hg-moin/mercurial/localrepo.py", line 460, in lookup
    raise repo.RepoError(_("unknown revision '%s'") % key)
RepoError: unknown revision '2'

Additionally cgitb raised this exception:
Traceback (most recent call last):
  File "/home/sensei/_workspace/_moin/MercurialBackend/MoinMoin/failure.py", line 176, in handle
    handler.handle(savedError)
  File "/home/sensei/_workspace/_moin/MercurialBackend/MoinMoin/support/cgitb.py", line 576, in handle
    doc = view.format(formatter, self.context)
  File "/home/sensei/_workspace/_moin/MercurialBackend/MoinMoin/support/cgitb.py", line 354, in format
    return formatter.section(self.formatContent(), {'class': 'cgitb'})
  File "/home/sensei/_workspace/_moin/MercurialBackend/MoinMoin/failure.py", line 44, in formatContent
    self.formatDebugInfo(),
  File "/home/sensei/_workspace/_moin/MercurialBackend/MoinMoin/failure.py", line 100, in formatDebugInfo
    self.formatTraceback(),
  File "/home/sensei/_workspace/_moin/MercurialBackend/MoinMoin/failure.py", line 113, in formatTraceback
    return self.formatAllTracebacks(self.formatOneTraceback)
  File "/home/sensei/_workspace/_moin/MercurialBackend/MoinMoin/failure.py", line 125, in formatAllTracebacks
    tracebacks.append(formatFuction((ttype, tvalue, tb)))
  File "/home/sensei/_workspace/_moin/MercurialBackend/MoinMoin/support/cgitb.py", line 434, in formatOneTraceback
    self.formatter.orderedList(self.tracebackFrames(info),
  File "/home/sensei/_workspace/_moin/MercurialBackend/MoinMoin/support/cgitb.py", line 445, in tracebackFrames
    frames.append(frame.format(self.formatter))
  File "/home/sensei/_workspace/_moin/MercurialBackend/MoinMoin/support/cgitb.py", line 202, in format
    items = [self.formatCall(),
  File "/home/sensei/_workspace/_moin/MercurialBackend/MoinMoin/support/cgitb.py", line 213, in formatCall
    self.formatArguments(),)
  File "/home/sensei/_workspace/_moin/MercurialBackend/MoinMoin/support/cgitb.py", line 233, in formatArguments
    formatvalue=formatValue)
  File "/usr/lib/python2.5/inspect.py", line 812, in formatargvalues
    specs.append(strseq(args[i], convert, join))
  File "/usr/lib/python2.5/inspect.py", line 767, in strseq
    return convert(object)
  File "/usr/lib/python2.5/inspect.py", line 809, in convert
    return formatarg(name) + formatvalue(locals[name])
  File "/home/sensei/_workspace/_moin/MercurialBackend/MoinMoin/support/cgitb.py", line 229, in formatValue
    return '=' + self.formatter.repr(value)
  File "/home/sensei/_workspace/_moin/MercurialBackend/MoinMoin/support/cgitb.py", line 133, in repr
    return pydoc.html.repr(object)
  File "/usr/lib/python2.5/pydoc.py", line 381, in repr
    return Repr.repr(self, object)
  File "/usr/lib/python2.5/repr.py", line 24, in repr
    return self.repr1(x, self.maxlevel)
  File "/usr/lib/python2.5/pydoc.py", line 388, in repr1
    return self.escape(cram(stripid(repr(x)), self.maxother))
  File "/home/sensei/_workspace/hg-moin/mercurial/context.py", line 30, in __repr__
    return "<changectx %s>" % str(self)
  File "/home/sensei/_workspace/hg-moin/mercurial/context.py", line 24, in __str__
    return short(self.node())
  File "/home/sensei/_workspace/hg-moin/mercurial/context.py", line 84, in node
    def node(self): return self._node
  File "/home/sensei/_workspace/hg-moin/mercurial/context.py", line 68, in __getattr__
    raise AttributeError, name
AttributeError: _node