Error log
Here is the error log on cPanel, not sure how to access the apache's error log, hope this help.
[Tue Oct 06 01:37:33 2015] [error] [client 180.190.82.83] File does not exist: /home/supplych/public_html/500.shtml, referer: Necessity of Quote Software
[Tue Oct 06 01:37:33 2015] [error]...