Ошибки в логах

[aidynchik]

Добрый день всем! Недавно заметил, что в логах периодически сыпятся ошибки, не ошибки даже, а warnings. При этом магазин работает исправно, все работает. Ошибки повторяются постоянно одни и те же

2012-06-01 17:02:43 - PHP Warning:  unlink(/usr/local/pem/vhosts/123361/webspace/httpdocs/system/cache/cache.language.1338569404): No such file or directory in /usr/local/pem/vhosts/123361/webspace/httpdocs/system/library/cache.php on line 14
2012-06-01 17:02:43 - PHP Warning:  session_start(): Cannot send session cookie - headers already sent by (output started at /usr/local/pem/vhosts/123361/webspace/httpdocs/index.php:104) in /usr/local/pem/vhosts/123361/webspace/httpdocs/system/library/session.php on line 11
2012-06-01 17:02:43 - PHP Warning:  session_start(): Cannot send session cache limiter - headers already sent (output started at /usr/local/pem/vhosts/123361/webspace/httpdocs/index.php:104) in /usr/local/pem/vhosts/123361/webspace/httpdocs/system/library/session.php on line 11
2012-06-01 17:02:43 - PHP Warning:  Cannot modify header information - headers already sent by (output started at /usr/local/pem/vhosts/123361/webspace/httpdocs/index.php:104) in /usr/local/pem/vhosts/123361/webspace/httpdocs/index.php on line 179
2012-06-01 17:02:43 - PHP Warning:  Cannot modify header information - headers already sent by (output started at /usr/local/pem/vhosts/123361/webspace/httpdocs/index.php:104) in /usr/local/pem/vhosts/123361/webspace/httpdocs/system/library/currency.php on line 45
2012-06-01 22:44:51 - PHP Warning:  unlink(/usr/local/pem/vhosts/123361/webspace/httpdocs/system/cache/cache.product.seopath.1338594289): No such file or directory in /usr/local/pem/vhosts/123361/webspace/httpdocs/system/library/cache.php on line 50

Версия магазина 1.5.1.3, изменения вносились хедер основной страницы, незначительные - добавились блоки контактов.