Scriptcase’s new ‘HTML Editor’ field type

i did alle steps explained here http://www.scriptcase.net/blog/scriptcases-new-html-editor-field-type/

But it is not working. I have the follwowing errors

http://XXXX/SQMS/_lib/prod/third/tiny_mce_new/js/tinymce/langs/de.js Failed to load resource: the server responded with a status of 404 (Not Found)

AND

http://development.mitsm.de/SQMS/_lib/js/tab_erro_de.js Failed to load resource: the server responded with a status of 404 (Not Found)

Has someone experience with this new feature?
thanks rob

mhh the file exists …

No it does not!!! I had to copy it form de-de.js to de.js