مشکل در ثبت نام

[webpen]

در قسمت ثبت نام وقتی در farsi.php من "نام" رو به "نام و نام خانوادگی" تغییر مردم این ارور میاد.

Warning: Cannot add header information - headers already sent by (output started at c:\apache\htdocs\language\farsi.php:1) in c:\apache\htdocs\index.php on line 212

Warning: Cannot add header information - headers already sent by (output started at c:\apache\htdocs\language\farsi.php:1) in c:\apache\htdocs\index.php on line 213

Warning: Cannot add header information - headers already sent by (output started at c:\apache\htdocs\language\farsi.php:1) in c:\apache\htdocs\index.php on line 214

Warning: Cannot add header information - headers already sent by (output started at c:\apache\htdocs\language\farsi.php:1) in c:\apache\htdocs\index.php on line 215

Warning: Cannot add header information - headers already sent by (output started at c:\apache\htdocs\language\farsi.php:1) in c:\apache\htdocs\index.php on line 216

مشکل از چیه؟