Attachments_uniqid is not defined

I’m getting this Javascript error, which is preventing the admin display of attachements. Have a fresh vanilla install. Any ideas?

ReferenceError: attachments_uniqid is not defined

attachment.attributes.attachment_uid = attachments_uniqid( ‘attachmentsjs’ );

Context

// loop through the selected files
                            selection.each( function( attachment ) {

                                // set our attributes to the template
                                attachment.attributes.attachment_uid = attachments_uniqid( 'attachmentsjs' );

                                // by default use the generic icon
                                attachment.attributes.attachment_thumb = attachment.attributes.icon;

http://wordpress.org/extend/plugins/attachments/