Staple size check error message appears twice

In redemption_image.rb,

class RedemptionImage < ActiveRecord::Base
  belongs_to :business, :touch => true

  has_attached_file :display_image, :url => "/system/:class/:attachment/:id_partition/:hash.:extension",
                               :hash_secret => "redemptionimagesqqqa"
  validates_attachment :display_image, :content_type => { :content_type => /\Aimage/ }, :size => { :in => 0..300.kilobytes,
:message => "must be lesser than 300 KB. Image height and width must be lesser than 500 px." }

      

        
        
        
      

    

there is a check for size, content_type and availability for display_image. It displays the message twice: Error saving image: Image image must be less than 300KB. Image height and width must be less than 500 pixels. The displayed image must be less than 300KB. Image height and width must be less than 500 pixels.

If no customized message is configured, it blinks twice as shown