error after installation of the arabic version of wordpress

After I downloaded the Arabic version of wordpress 3.1.1 and made the changing in the wp-config.php file, and uploaded it to the server, and after installation was succeed, I get the following error when I tried to login to the wp-admin:
Warning: Cannot modify header information – headers already sent by (output started at /home/onlinemo/domains/8and14ofmarch.com/public_html/wp-config.php:1) in /home/onlinemo/domains/8and14ofmarch.com/public_html/wp-includes/pluggable.php on line 897.

could you please help me to solve this problem?
many thanks.