Guys, how to solve the problem with OpenCart authorization?

Question

HTTP Cookies

Guys, there was a problem with authorization on a friend's site on opencart at the address - www.air21.ru
When you open the page, the site swears loudly. I myself am a layout designer in PHP, I don’t really rummage, tell me how to fix it? I searched the forums, but did not find anything worthwhile on this problem ((
Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at /home/air21/air21.ru/docs/ system/library/weight.php:1) in /home/air21/air21.ru/docs/system/library/session.php on line 9
Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /home/air21/air21.ru/docs/system/library/weight.php:1) in /home/air21/air21.ru/docs/system/library/session.php on line nine
Warning: Cannot modify header information - headers already sent by (output started at /home/air21/air21.ru/docs/system/library/weight.php:1) in /home/air21/air21.ru/docs/index. php on line 179
Warning: Cannot modify header information - headers already sent by (output started at /home/air21/air21.ru/docs/system/library/weight.php:1) in /home/air21/air21.ru/ docs/system/library/currency.php on line 45

Answer 1

Information is generally googled for less than a minute:
http://ru.stackoverflow.com/questions/247691/Prob...
www.cyberforum.ru/php-beginners/thread765684.html
joomlaforum.ru/index.php?topic=34534.0
Well, nothing , I googled for you.