"DLL load failed" when using mercurial on trac

Question

My mercurial repository works correctly in trac when I use the tracd server.

However, when I use apache, I get the following warning at the top of all trac pages:

Warning: Can't synchronize with repository "(default)" (Unsupported version control system "hg": DLL load failed: The specified module could not be found.). Look in the Trac log for more information.

The trac log doesn't have anything useful except a warning about mercurial being compiled with Python 2.6.2 and the actual version of Python running being 2.6.4.

Does anyone have any ideas on how to solve this?

Versions:

• Python 2.6 (binary installer from python.org)
• trac 0.12.2 (using easy_install)
• mercurial (the Windows pre-built binary from tortoisehg)

Apache is running on a Windows XP (32-bit) machine for testing. I have admin rights, but I think that apache is running as Local User.

Answer 1

I have the same problem. There is no problem in mercurial package version 1.7.1. The mistake appears in higher versions, up to 1.8.

Answer 2

I ran into a similar error when setting up hgweb (no trac). Hopefully this helps you and anyone else doing the same thing and finding this question via Google.

I solved the problem by using the python library mercurial installer instead of the normal windows msi (or tortoisehg) installer ("Mercurial-1.8.1 (32-bit py2.6)" from https://www.mercurial-scm.org/wiki/Download) and ensuring the mercurial libs import line in hgweb.cgi is commented out.