Why does the template in Bitrix not work after stretching?

Question

1C-Bitrix

I removed the old template on Bitrix and installed a new one, but it does not work, although I configured everything correctly according to the instructions. D Bitrix has a folder where all the templates are located, after putting the template there, it is visible in the admin panel, and you can install it there. In the admin panel, I put this theme, but the site is just white.
How can I fix this? I've been struggling with this for 2 days now.

Answer 1

Check carefully the header.php file in the template.
At the beginning it should be

if(!defined('B_PROLOG_INCLUDED') || B_PROLOG_INCLUDED ==!true)
      die();

Answer 2

Most likely a php error, enable the display of errors in Bitrix (bitrix/.settings.php set 'debug' => true)