Hi Nishan,
The HTTP 500 error appears to be due to this:
[Thu Oct 16 01:22:59.284874 2014] [core:alert] [pid 955166:tid 139686236325632] [client 198.91.81.4:42026] /home/nishan/.htaccess: RedirectMatch takes two or three arguments, an optional status, then a regular expression and destination...