activeadmin - error undefined method `group_values' in active_admin rails -


I try to apply active_admin to my app, and I am following this tutorial: 

  http://activeadmin.info/documentation.html   
 But when I am executing this command in my console:  
  Generates Rail Activation: Resource Product   
 produces the file successfully:  
  app / admin / product.rb  < / Pre> 
 But when I'm active in the Active_admin index I get this kind of error when using the page:  
  Undefined method 'group_iman' for ActionView :: Template :: error (# & lt; Array: 0xcfe093c & gt;)   
 How to fix it? Your administrator / product.rb allows you to enter this code:  
 
 
 Thank you before:  
 ActiveAdmin.register Product, as: = & gt; "All Products"  
 end  
 Hope that help

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