mailer.py: TypeError in apply_textdelta

Running with svn revision 5583, I'm trying mailer.py for the first
time and getting this error:

$ ./mailer.py /export/home2/svn/repositories/test 1 ./mailer.conf
Traceback (most recent call last):
  File "./mailer.py", line 799, in ?
    svn.util.run_app(main, config_fname, repos_dir, revision)
  File "/opt/i386-linux/installed/subversion-r5583/lib/svn-python/svn/util.py", line 38, in run_app
  File "./mailer.py", line 48, in main
    pool)
TypeError: apply_textdelta() takes exactly 4 arguments (3 given)

Any ideas? I have no python/swig fu....

Best,
Blair

-- 
Blair Zajac <blair@orcaware.com>
Plots of your system's performance - http://www.orcaware.com/orca/
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