undefined method `model_name' for NilClass:Class

Extracted source (around line #1):

1: <%= form_for(@category) do |f| %>
2:   <% if @category.errors.any? %>
3:     <div id="error_explanation">
4:       <h2><%= pluralize(@category.errors.count, "error") %> 
prohibited this category from being saved:</h2>

this is another error i encounterd while trying to create a new category 
in my category model.

can someone pls help out on this

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