Rails - Oct 2012 - Validation messages and $.parseJSON(xhr.responseText).errors

Hello!

I try to catch a validation message with a 
`$.parseJSON(xhr.responseText).errors` but an alert message hows me 
"undefined"  and I do not understand why.

hier are my validations:
  

    validates :upload_file_name,  :presence   => true,
                                    :format     =>{:with => 
%r{\.(jpg)$}i,:message =>"It should be a pdf File"}
                                    
      validates_uniqueness_of :upload_file_name, :message =>
"blabla"
     
      validates :upload_file_size,  :inclusion  => {:in 
=>1.megabytes..20.megabytes,:message=>"bla"}

json:
 

    format.json{ render json: {error: @upload.errors.full_messages}, 
:status =>422}

and javascript for that:

     $(''#fileupload'').fileupload({       
    
    
            error: function(xhr){
              var errors = $.parseJSON(xhr.responseText).errors
              alert(errors)         
            }
                  });

Thanks in advanced
 

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