try to add   <%= javascript_include_tag :defaults %> in your layout
file

On Mar 30, 12:31 am, ES <[email protected]> wrote:
> I followed this railscast to add "complex" functionality to a form.  I
> added the ability to click a link to add an element to an object form
> and a link to remove it.
>
> http://railscasts.com/episodes/74-complex-forms-part-2
>
> However I am getting this error when I click "add element"
>
> RJS error:
>
> TypeError: Element.insert is not a function
>
> and then
>
> Element.insert("docs", { bottom: "<div class=\"doc\">\n\n
> Doc: <input .....etc

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