What does this error mean: Fatal error: Unknown: Cannot use output buffering in output buffering display handlers in Unknown on line 0?

Question

1C-Bitrix

Hello, please tell me what this error means:
Fatal error: Unknown: Cannot use output buffering in output buffering display handlers in Unknown on line 0
Because of what it could appear, and how to fix it.
This error appears when I click on the "+ Create product" button or when I try to edit already entered products in the "Shop" section in the 1C-Bitrix CMS.
Thank you in advance.

Answer 1

Banned on google?

Translation

Неустранимая ошибка: Неизвестно: невозможно использовать буферизацию вывода в обработчиках отображения буферизации вывода в поле Неизвестно в строке 0

The very first link in Google leads to Bitrix support