Blank page in admin area (Magento)

If in your back-end at one of the Smart Slider's pages you get a blank page, you can probably make your website write the error if you open this file:


And put this code right under the <?php part:

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

If the php code is getting as far as this file is, which usually does, then it will turn on the error reporting, and the blank page will show an error message.