WYSIWYG not working on repeatable Fields

I’m using WordPress 3.4.2 (German Edition) with Simple Fields 1.1.4. When I add a Repeatable Field with Wysiwgy I get the following JS Error in the Console and the TinyMCE doesn’t show anything:

Failed to load: http://domain.com/wp-includes/js/tinymce/themes/simple/editor_template.js

It’s strange, because this should be a core file which not exists in the standard installation.

Thx for your help!

http://wordpress.org/extend/plugins/simple-fields/