Rails - Mar 2009 - Rails 2.3.2 won't start with "can't modify frozen class/module"

Hi all.

Rails 2.3.2 won''t start for me. It says "can''t modify
frozen class/
module", on this statement in my environment.rb:

config.action_view.erb_trim_mode = "-%".

Anybody have any ideas? Did I hit a bug?
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