js failure

Can anybody tell me what does this mean? This is showing up every time a wysiwyg editable field is saved.What is a possible fix?

Warning: file_get_contents(sites/all/libraries/whizzywig/xhtml.js) [function.file-get-contents]: failed to open stream: No such file or directory in drupal_build_js_cache() (line 4940 of /var/www/html/includes/common.inc).