TortoiseHg: ImportError: No module named repo

Problem:
I updated my TortoiseHg from version 2.4 to 2.6.2. When I try to launch Hg Workbench for the 1st time, it shows the following error:

#!python     ** Mercurial version (2.4.2).  TortoiseHg version (2.6.2)     ** Command: --nofork workbench     ** CWD: C:\Code     ** Encoding: cp1252     ** Extensions loaded: hgsubversion     ** Python version: 2.7.3 (default, Apr 10 2012, 23:31:26) [MSC v.1500 32 bit (Intel)]     ** Windows version: sys.getwindowsversion(major=6, minor=1, build=7601, platform=2, service_pack='Service Pack 1')     ** Processor architecture: x86     ** Qt-4.8.0 PyQt-4.9.1     Traceback (most recent call last):       File "tortoisehg\hgqt\workbench.pyo", line 564, in openRepo       File "tortoisehg\hgqt\workbench.pyo", line 934, in _openRepo       File "tortoisehg\hgqt\thgrepo.pyo", line 53, in repository       File "mercurial\hg.pyo", line 111, in repository       File "mercurial\hg.pyo", line 106, in _peerorrepo       File "C:\Code\hgsubversion\hgsubversion\__init__.py", line 179, in reposetup       File "mercurial\demandimport.pyo", line 86, in __getattribute__       File "mercurial\demandimport.pyo", line 58, in _load       File "C:\Code\hgsubversion\hgsubversion\svnrepo.py", line 99, in <module>       File "mercurial\demandimport.pyo", line 86, in __getattribute__       File "mercurial\demandimport.pyo", line 58, in _load     ImportError: No module named repo

Solution:
It was actually caused by the out-dated hgsubversion extension.

1. goto TortoiseHg -> Global Settings
2. Extensions -> Edit File
3. comment out the hgsubversion variable with #
4. Hg Workbench should launch correctly now
5. update to the latest version of hgsubversion
6. re-enable the extension


Ref:
tortoisehg / thg / issues / #2090 - No module named repo — Bitbucket