Bad value for attribute action on element form

[ghost]

I have enclosed Haste to the Votebox extension of Yanick and stumble across the following error:

Line number 652
<form action="' . $this->action . '" id="' . $this->strFormId . '" enctype="' . ($this->hasUploads ? 'multipart/form-data' : 'application/x-www-form-urlencoded') . '" method="' . $this->method . '">

Browser output:
<form action="" id="vb_new_idea" enctype="application/x-www-form-urlencoded" method="post">

Bad value for attribute action on element form: Must be non-empty.

Any URL. For example: /hello, #canvas, or http://example.org/. Characters should be represented in NFC and spaces should be escaped as %20.