Ошибка

Здравствуйте, подскажите пожалуйста как убрать данную ошибку и из-за чего она появляется ?
[Tue Feb 22 20:12:31.734660 2022] [php7:error] [pid 3267] [client 46.39.248.80:52202] PHP Fatal error: Uncaught Error: Call to undefined function get_header() in /var/www/admin/data/www/smola-derevo.ru/index.php:11\nStack trace:\n#0 {main}\n thrown in /var/www/admin/data/www/smola-derevo.ru/index.php on line 11

Hello,

Make sure the theme and all the plugins in Appearance > Install plugins have been updated. If they have, deactivate all the plugins except these ones:

Slider Revolution
WPBakery Page Builder or Elementor
Woodmart Core
Contact Form 7
MailChimp for WordPress
WooCommerce
Safe SVG
Switch to the parent theme and check the issue.

If the problem has gone, activate the plugins one by one, checking the issue to detect which one causes the problem.

Best Regards

[Author]

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