Although an electronic security system can protect your facility, only manned guarding can be responsive enough to react to any eventuality. The requested URL /sourceengine/index.php was not found on this server.
Guards and security staff give a personal touch to your building and ensure that it is secure but still welcoming to potential clients. Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.
Even though you want your facility to be secure, you do not want to alienate potential clients or customers, hence a manned guard could be the perfect solution.