validates_presence_of validating twice?

I'm getting some weird behavior in one of my models. I have a model
defined something like this

class User < ActiveRecord::Base
  attr_accessor :password

  validates_presence_of :password
end

If I validate the model without specifying a password, I get ["can't be
blank", "can't be blank"] for :password instead of just one "cant't be
blank". If I comment out the validates_presence_of statement, then no
errors. So it doesn't seem like it's being defined elsewhere(though a
plugin or some such). Any idea what might be going on here?

Thanks,
Steve

When you call the page, do you use a request.post?

This can happen if the model file gets loaded twice. Do you have

  require 'user'

somewhere in your code?

Yes, I had a "load" statement in there that was causing this to happen.
Thanks.