Source Tree: Error encountered when trying to open hg repos

hg status' failed with code 1:'*** failed to import extension hgext.hgsubversion from /Applications/SourceTree.app/Contents/Resources/mercurial_local/hgext/hgsubversion: 'module' object has no attribute 'canonpath'
** Unknown exception encountered with possibly-broken third-party extension hgattic
** which supports versions unknown of Mercurial.
** Please disable hgattic and try your action again.
** If that fixes the bug please report it to the extension author.
** Python 2.7.5 (default, Mar  9 2014, 22:15:05) [GCC 4.2.1 Compatible Apple LLVM 5.0 (clang-500.0.68)]
** Mercurial Distributed SCM (version 3.2.3)
** Extensions loaded: transplant, fetch, extdiff, rebase, strip, mq, hgattic, hgflow, gpg, sourcetree_auth, progress, sourcetree_checklink
Traceback (most recent call last):
  File "/Applications/SourceTree.app/Contents/Resources/mercurial_local/hg_local", line 35, in <module>
    mercurial.dispatch.run()
  File "/Applications/SourceTree.app/Contents/Resources/mercurial_local/mercurial/dispatch.py", line 28, in run
    sys.exit((dispatch(request(sys.argv[1:])) or 0) & 255)
  File "/Applications/SourceTree.app/Contents/Resources/mercurial_local/mercurial/dispatch.py", line 71, in dispatch
    ret = _runcatch(req)
  File "/Applications/SourceTree.app/Contents/Resources/mercurial_local/mercurial/dispatch.py", line 140, in _runcatch
    return _dispatch(req)
  File "/Applications/SourceTree.app/Contents/Resources/mercurial_local/mercurial/dispatch.py", line 817, in _dispatch
    repo = hg.repository(ui, path=path)
  File "/Applications/SourceTree.app/Contents/Resources/mercurial_local/mercurial/hg.py", line 128, in repository
    peer = _peerorrepo(ui, path, create)
  File "/Applications/SourceTree.app/Contents/Resources/mercurial_local/mercurial/hg.py", line 115, in _peerorrepo
    obj = _peerlookup(path).instance(ui, path, create)
  File "/Applications/SourceTree.app/Contents/Resources/mercurial_local/mercurial/hg.py", line 89, in _peerlookup
    return thing(path)
  File "/Applications/SourceTree.app/Contents/Resources/mercurial_local/hgext/hgsubversion/__init__.py", line 185, in _lookup
    if util.islocalrepo(url):
AttributeError: &#x27;NoneType&#x27; object has no attribute &#x27;islocalrepo&#x27;