Hi friends now I am going to show you a next part of this article. This is the 3rd part of the Centre Point of Magento development guide line. Pre-Launch Checklist. Error Page Design- When there is an error on the site, or the maintenance.flag file is set, a different theme is used to display the error message. Without changing this your customers will see the Magento logo and default theme. To adapt this page to your own template you will need to modify the files located in the errors directory.