Magento error: Your web server is configured incorrectly. As a result, configuration files with sensitive information are accessible from the outside. Please contact your hosting provider.

Magento error:
Your web server is configured incorrectly. As a result, configuration files with sensitive information are accessible from the outside. Please contact your hosting provider.

Solution:
This error is caused by /app/etc/local.xml being readable by the world. Set the permissions to 551