[Rails] undefined method `stringify_keys' for #

>From my understanding, you can pass a block to the link_to helper, but the following code gives me an error "undefined method `stringify_keys' for #". = link_to("One time Payment with Paypal or Credit Card", @order.payment_payment_standard_url(new_order_url(invoice: @invoice), payment

[Rails] undefined method `stringify_keys!' for "":String

i have an error undefined method `stringify_keys!' for "":String my view is given below <%= form_tag :action => 'resolve_create', :resolve => @resolve %> resolution: <%= text_area 'resolve','content', :cols => 40, :rows => 12 %> <%= submit_tag "save" %> what is dat error and how