Unknown exception error in 1.4.1

[hua]

I was playing around with mercurial.ini in c:\program files\mercurial by
adding,

[alias]
r = rollback

When I do a 'hg st' afterward, mercurial cough this out

** unknown exception encountered, details follow
** report bug details to http://mercurial.selenic.com/bts/
** or mercurial at selenic.com
** Mercurial Distributed SCM (version 1.4.1+20091201)
** Extensions loaded: win32text, extdiff, graphlog
Traceback (most recent call last):
File "hg", line 27, in <module>
File "mercurial\dispatch.pyc", line 16, in run
File "mercurial\dispatch.pyc", line 30, in dispatch
File "mercurial\dispatch.pyc", line 46, in _runcatch
File "mercurial\dispatch.pyc", line 373, in _dispatch
File "mercurial\dispatch.pyc", line 227, in addaliases
File "mercurial\dispatch.pyc", line 199, in __init__
ValueError: need more than 2 values to unpack
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