How to fix Error:Premature end of file?

Question

PHP

Hello. For some reason, the XML validation built into PhpStorm throws an error Error:Premature end of file.

There is an extra indent at the end of the XML file, maybe the error is due to it? How then to remove it?

I create a file using DOM:

# Инициализация DOM и его настройка #
$yandexFeed = new DOMDocument('1.0', 'utf-8');
$yandexFeed->formatOutput = true;
$yandexFeed->preserveWhiteSpace = false;
...
# Наполнение XML #
...
$yandexFeed->save('yaOut.xml');

Even if you remove , it still creates an extra indent. $yandexFeed->formatOutput = true;