rake doc:plugins error

I am trying to generate documentation for my plugins using
the rake
task and I am receiving an error. It seems to fail on the
first plugin
'acts_as_state_machine' with the following output:

======================================
rdoc -o doc/plugins/acts_as_state_machine --title 'Acts As
State
Machine Plugin Documentation' --line-numbers --inline-source
-T html --
main 'vendor/plugins/acts_as_state_machine/README'
vendor/plugins/
acts_as_state_machine/lib/acts_as_state_machine.rb
vendor/plugins/
acts_as_state_machine/README
vendor/plugins/acts_as_state_machine/
CHANGELOG
rake aborted!
You have a nil object when you didn't expect it!
The error occurred while evaluating nil.exitstatus

(See full trace by running task with --trace)
======================================

I am using Rails 2.0.2. Anyone have any ideas?

Thanks,
-kevin
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