image uploadin error

hi all! I m trying to upload image using paperclip in rails3…

In users controller of my application (M TRYIN TO DISPLAY THE IMAGE IN THE SAME PAGE OF UPLOAD FILE(BUTTON) PAGE ) i ve defined 2 methods def photo end def update_photo end ** In photo.html.erb** <%= image_tag @user.avatar.url(:medium) %> <%= button_to “Delete”, user, :method => :delete, :confirm => ‘Are you sure to delete the image’ %> <% form_for :user, @user, :url => update_photo_user_path(current_user), :html => { :multipart => true } do |form| %>

WEN I RUN DIS CODE IN THE BROWSER I GET

undefined method `avatar' for nil:NilClass ERROR

choose: <%= form.file_field :avatar %>
<%= submit_tag(“Uploadfile”) %>

Hi, In user model, do u have any field named avatar? and also y ur passing user as symbol and instance variable in form_for tag? remove the symbol.

Thanks, Manivannan.s