CSS don't work on wicked_pdf

Hi! I’m using the wicked_pdf and I have a problem. The css don’t work.
How
use correctly?

My code is this:

application.html.erb

WickedPdfExample *<%= wicked_pdf_stylesheet_link_tag "bootstrap.min.css" -%>* * <%= wicked_pdf_stylesheet_link_tag "application.css" -%>* <%= stylesheet_link_tag 'application', media: 'all', 'data-turbolinks-track' => true %> <%= javascript_include_tag 'application', 'data-turbolinks-track' => true %> <%= csrf_meta_tags %>
<%= yield %>

customers_controller.erb
def index
@customers = Customer.all
respond_to do |format|
format.html
format.pdf do
render :pdf => ‘file_name’,
:template => ‘customers/index.pdf.erb’,
:show_as_html => params[:debug].present?
end
end
end

index.pdf.erb

Listing Customers

<% @customers.each do |customer| %> <% end %>
Name Cpf Occupation
<%= customer.name %> <%= customer.cpf %> <%= customer.occupation %>

And sometimes, get this error:

undefined method `start_with?’ for nil:NilClass

What I 'm making wrong?

up

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