PHP 8.1

After upgrading Magento to version 2.4.4 and PHP 8.1, you might have this error 

Type Error occurred when creating object: Magento\Framework\Communication\Config\Data, Magento\Framework\Reflection\TypeProcessor::resolveFullyQualifiedClassName(): Argument #2 ($typeName) must be of type string, null given, called in /{magento_root}/vendor/magento/framework/Reflection/TypeProcessor.php on line 550