TYPO3 Exception 1176558158

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TYPO3 11.5.21 -03.01.2023

An argument "site" does not exist for this request.

Situation

This happens when you call the following in an action of an Extbase controller:

$site =  $this->request->getArgument('site');

Solution

You must retrieve the site configuration with getAttribute() not getArgument:

$site =  $this->request->getAttribute('site');