SoftException in Application.cpp:601: Directory is writable by public - cpanel

[keen_prat]

I guess trouble are popping up with me a lot, here is the error I am facing on a cpanel based CentOS 6 server. It came up suddenly. On page I am seeing "500 internal server error"

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Internal Server Error

The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator, webmaster@mydomain..com and inform them of the time the error occurred, and anything you might have done that may have caused the error.

More information about this error may be available in the server error log.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.
Apache/2.2.21 (Unix) mod_ssl/2.2.21 OpenSSL/0.9.8e-fips-rhel5 mod_auth_passthrough/2.1 mod_bwlimited/1.4 FrontPage/5.0.2.2635 Server at www.mydomain.com Port 80
I checked error log and found following errors..

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[Fri Dec 07 14:58:07 2012] [error] [client 38.109.219.100] File does not exist: /home/keenp/public_html/500.shtml
[Fri Dec 07 14:58:07 2012] [error] [client 38.109.219.100] SoftException in Application.cpp:601: Directory "/home/keenp/public_html/keen" is writeable by group
[Fri Dec 07 14:58:07 2012] [error] [client 66.249.73.182] File does not exist: /home/keenp/public_html/500.shtml
[Fri Dec 07 14:58:07 2012] [error] [client 66.249.73.182] SoftException in Application.cpp:601: Directory "/home/keenp/public_html/keen" is writeable by group
[Fri Dec 07 14:58:02 2012] [error] [client 82.145.217.66] File does not exist: /home/keenp/public_html/500.shtml
I thought its because of .htaccess.. I completely removed it but still nothing happened, where could be the problem ?