How to see extended error information

Sometimes, a store may show just a blank screen or a simple error 500 response. A detailed error information is required here to investigate the issue. It can be enabled by adding these changes to the code.

Find this file:
/system/startup.php

At the top of this file add these lines:

error_reporting(E_ALL);
ini_set('display_errors', 1);
ini_set('display_startup_errors', 1);

In many cases, the store will show an extended error information after after adding these lines.