This is what i've tried using paperclip

My Model.rb
 validates_presence_of :book_name, :price, :description, :author

  has_attached_file :avatar, :default_url =>
"/images/:style/missing.png"
  validates_attachment_content_type :avatar, :content_type =>
["image/jpg", "image/jpeg", "image/png", "image/gif"]

i'm not using styles because it is giving error "Avatar
Paperclip::Errors::NotIdentifiedByImageMagickError"

In Index File
the tag i'm using.
<td><%= image_tag booki.avatar.url(:thumb)%></td>

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