Tidak bisa ganti permalink di WP 3.9

teman-teman, mau tanya, saya buat web dengan wordpress 3.9, nah waktu saya mau change permalink, keluar kata” ini :

Not Acceptable
An appropriate representation of the requested resource /wp-admin/options-permalink.php could not be found on this server.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

itu kira” kenapa ya? thx..