First argument in form cannot contain nil or be empty - Rails 4

Question

I receive this error with my contact form in rails:

First argument in form cannot contain nil or be empty

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Answer 1

If in fact your instance variable is supposed to be nil, you could use :contact instead of @contact and provide a path.

In your case, the code should be,

<%= form_for( :contact , :html => {:class => "form-horizontal", :role => "form"}, url: login_path) do |form| %>

The login_path is just an example and can be replaced as seen fit.