My site has this Fatal Error

Hello..Not sure where to put this properly but I am hopeless..Can someone help me where should I check this problem?

Fatal error: Allowed memory size of 33554432 bytes exhausted (tried to allocate 11289488 bytes) in /home/yanihost/public_html/littlepeanut.info/wp-includes/cache.php on line 4

My site is not visible until now and I just want it solve asap.

Thanks for helping!