Rails 3.0 and counter_cache error

Hello,
I’m working on a rails 3.0 project and today I tried to add a counter
cache column, but I keep getting this error:

ArgumentError: Unknown key(s): counter_cache

This happens with any combinations of rails 3.0 beta4, rc, ruby 1.8.7
and 1.9.2.

Regards
Andrea

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