Ruby on Rails

I'm trying out Rails 3 with MongoMapper for a new application, and have
run into a bug when both MongoMapper::Document and
ActiveModel::Validations are used in the same model, in this case
job.rb. I can create a new model with the various validations I require,
but when I attempt to save it I get:

NoMethodError: undefined method `_run_before_save_callbacks' for
#<Job:0x007fe033a42958>

Google doesn't come up with much for this other than suggestions to rely
only upon MongoMapper, which I would rather not do. So, if anyone can
suggest a workaround it would be very useful.
Thanks!

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