I get the exception shown in the attached file with all attempts to clone or pull data from a Subversion repository. I have tested several repositories with the same result.
Configuration is: hg 1.9.2 with Python 2.6.5 on Cygwin. (I get the same behaviour from TortoiseHg GUI or command-line client.) HgSubversion tag 1.3 or tip show the same behaviour.