This looks like the same problem I had last week,
I was pointed towards a fix at http://dev.rubyonrails.com/ticket/971
> Hi,
>
> when using the following code in my model I get 2 errors for only 1 
> field.
>
>     belongs_to :category
>     validates_presence_of :title, :message => "required field
missing"
>
> Then when I test the validation by creating  a record without a title 
> I''m told that the title field is missing twice. Please help as
this
> has has me stumped for a few days now.
>
> Many Thanks
>
> Kieran
>
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>