# Strange error message when rendering the scaffold form

**URL:** <https://www.ruby-forum.com/t/strange-error-message-when-rendering-the-scaffold-form/192674>\
**Category:** Rails\
**Created:** [August 3, 2010, 9:15pm UTC](https://www.ruby-forum.com/t/strange-error-message-when-rendering-the-scaffold-form/192674 "2010-08-03T21:15:54Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![rodrigo3n](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/a8b319/32.png) [@rodrigo3n](https://www.ruby-forum.com/u/rodrigo3n)\
**Post date:** [August 3, 2010, 9:15pm UTC](https://www.ruby-forum.com/t/strange-error-message-when-rendering-the-scaffold-form/192674/1 "2010-08-03T21:15:54Z")

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Hello everyone, I am developing my application and I created a  
scaffold called listas, but when I acess /listas/new I get this error  
message:

NoMethodError in Listas#new

Showing /home/rodrigo3n/code/listeiroo/app/views/listas/\_form.html.erb  
where line #15 raised:

undefined method `deep\_symbolize\_keys’ for nil:NilClass  
Extracted source (around line #15):

12: \<% end %\>  
13:  
14:

  
15: \<%= f.label :nome %\>  
  
16: \<%= f.text\_field :nome %\>  
17: 
  
18: 
  
Trace of template inclusion: app/views/listas/new.html.erb

I am using Rails 3RC and Ruby 1.9.2-rc2. This error is very strange to  
me because I did just create the scaffold via “% rails g scaffold” and  
then this error appeared. Do you know why?

Thanks,  
Rodrigo Alves V.

---

<div class="post-metadata">

**Author:** ![rodrigo3n](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/a8b319/32.png) [@rodrigo3n](https://www.ruby-forum.com/u/rodrigo3n)\
**Post date:** [August 3, 2010, 10:10pm UTC](https://www.ruby-forum.com/t/strange-error-message-when-rendering-the-scaffold-form/192674/2 "2010-08-03T22:10:58Z")

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On Aug 3, 2:14 pm, rodrigo3n [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote:

> Extracted source (around line #15):  
> I am using Rails 3RC and Ruby 1.9.2-rc2. This error is very strange to  
> me because I did just create the scaffold via “% rails g scaffold” and  
> then this error appeared. Do you know why?

Did you migrate the database?

Jeff  
[purpleworkshops.com](http://purpleworkshops.com)