Attribute does not exist

[SergeyMC9730]

Full error:

Exception Object
(
    [message:protected] => Attribute does not exist
    [string:Exception:private] => 
    [code:protected] => 0
    [file:protected] => /var/www/phpvirtualbox/endpoints/lib/vboxServiceWrappers.php
    [line:protected] => 56
    [trace:Exception:private] => Array
        (
            [0] => Array
                (
                    [file] => /var/www/phpvirtualbox/endpoints/lib/vboxconnector.php
                    [line] => 3982
                    [function] => __get
                    [class] => VBox_ManagedObject
                    [type] => ->
                )

            [1] => Array
                (
                    [file] => /var/www/phpvirtualbox/endpoints/lib/vboxconnector.php
                    [line] => 3574
                    [function] => _machineGetNetworkAdapters
                    [class] => vboxconnector
                    [type] => ->
                )

            [2] => Array
                (
                    [file] => /var/www/phpvirtualbox/endpoints/lib/vboxconnector.php
                    [line] => 951
                    [function] => remote_machineGetDetails
                    [class] => vboxconnector
                    [type] => ->
                )

            [3] => Array
                (
                    [file] => /var/www/phpvirtualbox/endpoints/api.php
                    [line] => 316
                    [function] => __call
                    [class] => vboxconnector
                    [type] => ->
                )

        )

    [previous:Exception:private] => 
)

OS Type: Linux (5.4.0-74-generic)
VirtualBox: 6.1.22 (144080)