Rails - Aug 2010 - paper clip plugin validation fails

hallo    friends i developpeda photo uploader using paper clip plugin
its   working  quite  well , but one problem is its able to upload all
kinds of  file. see i  want only  png,gif,jpeg and  should show error
message if validation fails.here if i applied validations in the model
the result is errors like this

ArgumentError (too few arguments):
  app/controllers/images_controller.rb:63:in `format''
  app/controllers/images_controller.rb:63:in `create''
  vendor/plugins/haml/rails/./lib/sass/plugin/rails.rb:19:in `process''
  /usr/lib/ruby/1.8/webrick/httpserver.rb:104:in `service''
  /usr/lib/ruby/1.8/webrick/httpserver.rb:65:in `run''
  /usr/lib/ruby/1.8/webrick/server.rb:173:in `start_thread''
  /usr/lib/ruby/1.8/webrick/server.rb:162:in `start''
  /usr/lib/ruby/1.8/webrick/server.rb:162:in `start_thread''
  /usr/lib/ruby/1.8/webrick/server.rb:95:in `start''
  /usr/lib/ruby/1.8/webrick/server.rb:92:in `each''
  /usr/lib/ruby/1.8/webrick/server.rb:92:in `start''
  /usr/lib/ruby/1.8/webrick/server.rb:23:in `start''
  /usr/lib/ruby/1.8/webrick/server.rb:82:in `start''
  -e:4:in `load''
  -e:4
here are  my  controller  code

def create


    @user = @current_user.id
    puts"usertrrrr"+@user.inspect
    @image = Image.new(params[:image].merge(:user_id => @user))
      if @image.save_with_permissions(params[:users])

         puts"if saved"

      else
          puts"if not saved"
         format.js   # create.js.rjs
         format.xml  { render :xml => @image.errors, :status =>
:unprocessable_entity }
        puts"hiiiiiiiiiiiiiiiiii"+@image.errors.inspect

      end
      #puts"check  the  srrors are"+@image.errors.inspect
     responds_to_parent { render }
 end

 here is  the model validation

validates_attachment_content_type :picture,
:content_type=>[''image/jpeg'',
''image/png'', ''image/gif''], :message =>
:missing_content_type

                       or
  validates_format_of :picture,:allow_blank=>true, :with =>
%r{\.(gif|jpg|png|jpeg|bmp)$}i,:message  => "Invalid file extension for
teaser image. Please upload files with the following extensions only :
.jpg, .jpeg, .png, .gif, .bmp"


can  anyone  help me  to  sort out this issue.please help me

Thanks In advance
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