All of a sudden all these warnings ?? and can't see my admin login page. My cart with the attributes isn't working either. Any connections?

Here are the warnings at the admin login. Can this be fixed?

Thanking you in advance.

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Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at /home/ustar/public_html/store/includes/classes/shopping_cart.php:3787) in /home/ustar/public_html/store/includes/functions/sessions.php on line 108

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /home/ustar/public_html/store/includes/classes/shopping_cart.php:3787) in /home/ustar/public_html/store/includes/functions/sessions.php on line 108

Warning: Cannot modify header information - headers already sent by (output started at /home/ustar/public_html/store/includes/classes/shopping_cart.php:3787) in /home/ustar/public_html/store/admin/includes/init_includes/init_templates.php on line 36

Warning: Cannot modify header information - headers already sent by (output started at /home/ustar/public_html/store/includes/classes/shopping_cart.php:3787) in /home/ustar/public_html/store/admin/includes/functions/general.php on line 21
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