Rails - Mar 2011 - NilClass in my partial

Hello everyone, in my Rails 3.0.4 app, I created a partial called 
_category.html.erb that makes part of the category scope of the app like 
categories_controller, category.rb (the model) and so on. But, when I do 
render the partial in app/views/categories/index.html.erb it shows the 
following error: 

NoMethodError in Categories#index

Showing *
/Users/saulolopes/code/parla/app/views/categories/_category.html.erb* where 
line *#1* raised:

undefined method `css'' for nil:NilClass

Extracted source (around line *#1*):

1: <li class="<%= "category-#{category.css}"%>">
2:   <%= link_to image_tag(category.picture_file_name),
category_path(category) %>
3:   <p class="<%= "category-title
cat-#{category.css}"%>"><%= link_to category.name,
category_path(category) %></p>
4: </li>


I am using Inherited Resources in my CategoriesController but I don''t
think
it''s actually causing any error.

Can anyone help? Thanks!

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Hello everyone, I just solve this problem. I had in my partial the following 
code:

<%= render :partial => "category" -%>

Then I changed to this:

<%= render :partial => "category", :collection => @categories
-%>

Thanks!

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