debug ON – PHP errors! please help

Hello, I turned the debug on.
If I enter my website I get those errors:

Notice: Use of undefined constant SID - assumed 'SID' in /wp-content/plugins/hyper-cache/cache.php on line 11

Warning: Invalid argument supplied for foreach() in /wp-content/plugins/hyper-cache/cache.php on line 275

Notice: Undefined index: location in /wp-content/plugins/hyper-cache/cache.php on line 113

Warning: Cannot modify header information - headers already sent by (output started at /wp-content/plugins/hyper-cache/cache.php:11) in /wp-content/plugins/hyper-cache/cache.php on line 132

Warning: Cannot modify header information - headers already sent by (output started at /wp-content/plugins/hyper-cache/cache.php:11) in /wp-content/plugins/hyper-cache/cache.php on line 133

Warning: Cannot modify header information - headers already sent by (output started at /wp-content/plugins/hyper-cache/cache.php:11) in /wp-content/plugins/hyper-cache/cache.php on line 134

Warning: Cannot modify header information - headers already sent by (output started at /wp-content/plugins/hyper-cache/cache.php:11) in /wp-content/plugins/hyper-cache/cache.php on line 136

Warning: Cannot modify header information - headers already sent by (output started at /wp-content/plugins/hyper-cache/cache.php:11) in /wp-content/plugins/hyper-cache/cache.php on line 139

Notice: Undefined index: status in /wp-content/plugins/hyper-cache/cache.php on line 140

Warning: Cannot modify header information - headers already sent by (output started at /wp-content/plugins/hyper-cache/cache.php:11) in /wp-content/plugins/hyper-cache/cache.php on line 144
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What can I do?