Failed to get OMV VirtualBox settings.

Fehler #0:
exception 'Exception' with message 'Failed to get OMV VirtualBox settings.' in /usr/share/phpvirtualbox/config.php:104
Stack trace:
#0 /usr/share/phpvirtualbox/config.php(81): phpVBoxConfig->getSettings()
#1 /usr/share/phpvirtualbox/endpoints/lib/config.php(156): phpVBoxConfig->__construct()
#2 /usr/share/phpvirtualbox/endpoints/lib/vboxconnector.php(128): phpVBoxConfigClass->__construct()
#3 /usr/share/openmediavault/engined/rpc/virtualbox.inc(134): vboxconnector->__construct()
#4 [internal function]: OMV\Engined\Rpc\VirtualBox->getMachines(Array, Array)
#5 /usr/share/php/openmediavault/rpc/serviceabstract.inc(124): call_user_func_array(Array, Array)
#6 /usr/share/php/openmediavault/rpc/rpc.inc(81): OMV\Rpc\ServiceAbstract->callMethod('getMachines', Array, Array)
#7 /usr/sbin/omv-engined(524): OMV\Rpc\Rpc::call('VirtualBox', 'getMachines', Array, Array, 1)
#8 {main}

<?php


/**
 * Copyright (C) 2016 OpenMediaVault Plugin Developers.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */


// require_once("/usr/share/php/openmediavault/functions.inc");
require_once "/usr/share/php/openmediavault/rpc/rpc.inc";


class PhpvbAuthOpenmediavaultAuth implements phpvbAuth
{
    public $capabilities = [
        "canChangePassword" => false,
        "canLogout" => true,
        "canModifyUsers" => false,
    ];


    public function login($username, $password)
    {
        $omvRpcContext = [
            "username" => "admin",
            "role" => OMV_ROLE_ADMINISTRATOR
        ];


//try 
{
            $result = \OMV\Rpc\Rpc::call("UserMgmt", "authUser", [
                "username" => $username,
                "password" => $password
            ], $omvRpcContext, OMV_RPC_MODE_REMOTE);


            // Return early.
            if (!$result["authenticated"]) {
                return;
            }


            $user = \OMV\Rpc\Rpc::call("UserMgmt", "getUser", [
                "name" => $username
            ], $omvRpcContext, OMV_RPC_MODE_REMOTE);


            // Only allow admin or users in the vboxusers group.
            if ($username === "admin" || in_array("vboxusers", $user["groups"])) {
                $_SESSION["admin"] = true;
                $_SESSION["valid"] = true;
                $_SESSION["user"] = $username;
            }
//} catch (Exception $e) {
            // Do nothing.
        }
    }


    public function changePassword($old, $new)
    {
        //
    }


    public function heartbeat($vbox)
    {
        //
    }


    public function logout(&$response)
    {
        $_SESSION = [];
        session_destroy();


        $response["data"]["result"] = 1;
    }


    public function listUsers()
    {
        //
    }


    public function updateUser($vboxRequest, $skipExistCheck)
    {
        //
    }


    public function deleteUser($user)
    {
        //
    }
}

Exception Object
(
    [message:protected] => RPC service 'UserMgmt' not found.
    [string:Exception:private] => 
    [code:protected] => 0
    [file:protected] => /usr/share/nginx/www/phpvirtualbox/endpoints/api.php
    [line:protected] => 134
    [trace:Exception:private] => Array
        (
        )


    [previous:Exception:private] => 
)

<?php
/**
 * Copyright (C) 2010-2012 Ian Moore <imooreyahoo@gmail.com>
 * Copyright (C) 2013-2015 OpenMediaVault Plugin Developers
 *
 * This file is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * any later version.
 *
 * This file is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this file. If not, see <http://www.gnu.org/licenses/>.
 */


use Exception;
use SplFileInfo as FileInfo;


class phpVBoxConfig
{
    // Static config items.
    public $location = "http://127.0.0.1:18083/";
    public $language = "en";
    public $startStopConfig = true;
    public $username = "";
    public $password = "";
    public $enableAdvancedConfig = false;


    // Automatic config items.
    public function __construct()
    {
        $settings = $this->getSettings();


        if (!$settings->enable) {
            die("alert('phpVirtualBox disabled by OpenMediaVault configuration.');");
        }


        $this->enableAdvancedConfig = $settings->enable_advanced;
        $this->username = $this->getVboxUserUsername();
        $this->password = $this->getVboxUserPassword();
    }


    private function getSettings()
    {
        // Normally we should use OMVRpc::exec for this but since pulling
        // it in caused issues in OMV we just call the RPC from the shell.
        $data = shell_exec("/usr/sbin/omv-rpc VirtualBox getSettings");


        if (!$data) {
            throw new Exception("Failed to get OMV VirtualBox settings.");
        }


        return json_decode($data);
    }


    private function getVboxUserUsername()
    {
        return "vbox";
    }


    private function getVboxUserPassword()
    {
        $file = new FileInfo("/etc/default/openmediavault-virtualbox");


        if (!$file->isReadable()) {
            throw new Exception("Can't read /etc/defaults/openmediavault-virtualbox");
        }


        $file = $file->openFile();
        $password = $file->fgets();


        $file = null;


        // Trim the password variable since it may contain a newline char.
        return trim($password);
    }
}