新規投稿を追加に入るとエラー

このようなエラーメッセージが出て、ビジュアルエディターが使えません。

Warning: include_once(/home/storage/9/e2/90/editorakojiro/public_html/wordpress/wp-includes/js/tinymce/langs/wp-langs.php) [function.include-once]: failed to open stream: No such file or directory in /home/storage/9/e2/90/editorakojiro/public_html/wordpress/wp-admin/includes/post.php on line 1568

Warning: include_once() [function.include]: Failed opening ‘/home/storage/9/e2/90/editorakojiro/public_html/wordpress/wp-includes/js/tinymce/langs/wp-langs.php’ for inclusion (include_path=’.:/usr/share/pear’) in /home/storage/9/e2/90/editorakojiro/public_html/wordpress/wp-admin/includes/post.php on line 1568