Regarding PHP error

When i go to my web address it shows the following error:
Warning: Class __PHP_Incomplete_Class has no unserializer in /home/content/n3pnexwpnas01_data02/40/3228040/html/wp-content/object-cache.php on line 520

Warning: Cannot modify header information – headers already sent by (output started at /home/content/n3pnexwpnas01_data02/40/3228040/html/wp-content/object-cache.php:520) in /home/content/n3pnexwpnas01_data02/40/3228040/html/wp-content/plugins/simple-adblock-notice/simple-adblock-notice.php on line 153

Warning: Cannot modify header information – headers already sent by (output started at /home/content/n3pnexwpnas01_data02/40/3228040/html/wp-content/object-cache.php:520) in /home/content/n3pnexwpnas01_data02/40/3228040/html/wp-includes/pluggable.php on line 1171

My site is crazy4tv.com

Thanks in advance