Out of Memory

I have a similar problem i think. This is the error i am getting: Feb 1 11:35:38 ip-192-169-245-175 kernel: [7471769.266952] Out of memory in UB 40530: OOM killed process 15705 (php-cgi) score 0 vm:262468kB, rss:92092kB, swap:0kB My site is down with a 500 error. I have restarted the apache server and nothing.