@@ -111,7 +111,17 @@ module Jekyll

       # Throw an exception if the layout couldn't be found.

       else

-        throw "No 'category_index' layout found."

+        raise <<-ERR

+

+

+===============================================

+ Error for category_generator.rb plugin

+-----------------------------------------------

+ No 'category_index.hmtl' in source/_layouts/

+ Perhaps you haven't installed a theme yet.

+===============================================

+

+ERR

       end

     end