ارور در هنکام فعال کردن بهینه سازی

سلام
من داخل پوشه مامبو4.6.5 فایلی با نام htaccess.txt ندیدم لذا مجبور شدم از فایل .htaccess مامبو 4.6.2 برای بهینه سازی لینکها استفاده کنم.که متاسفانه این ارور ها رو میده:

Warning: Cannot modify header information - headers already sent by (output started at C:\Program Files\xampp\htdocs\mambo_465_farsi\administrator\c omponents\com_sef\language\english.php:1) in C:\Program Files\xampp\htdocs\mambo_465_farsi\includes\core.c lasses.php on line 424

Warning: Cannot modify header information - headers already sent by (output started at C:\Program Files\xampp\htdocs\mambo_465_farsi\administrator\c omponents\com_sef\language\english.php:1) in C:\Program Files\xampp\htdocs\mambo_465_farsi\includes\core.c lasses.php on line 601

Warning: Cannot modify header information - headers already sent by (output started at C:\Program Files\xampp\htdocs\mambo_465_farsi\administrator\c omponents\com_sef\language\english.php:1) in C:\Program Files\xampp\htdocs\mambo_465_farsi\includes\core.c lasses.php on line 602

Warning: Cannot modify header information - headers already sent by (output started at C:\Program Files\xampp\htdocs\mambo_465_farsi\administrator\c omponents\com_sef\language\english.php:1) in C:\Program Files\xampp\htdocs\mambo_465_farsi\includes\core.c lasses.php on line 603

Warning: Cannot modify header information - headers already sent by (output started at C:\Program Files\xampp\htdocs\mambo_465_farsi\administrator\c omponents\com_sef\language\english.php:1) in C:\Program Files\xampp\htdocs\mambo_465_farsi\includes\core.c lasses.php on line 604

Warning: Cannot modify header information - headers already sent by (output started at C:\Program Files\xampp\htdocs\mambo_465_farsi\administrator\c omponents\com_sef\language\english.php:1) in C:\Program Files\xampp\htdocs\mambo_465_farsi\includes\core.c lasses.php on line 605