try to get it work

admin/src/Controller/PartController.php

@@ -0,0 +1,16 @@
+<?php
+/**
+ * @package		Depot.Administrator
+ * @subpackage	com_depot
+ * @author		Thomas Kuschel <thomas@kuschel.at>
+ * @copyright	(C) 2023 KW4NZ, <https://www.kuschel.at>
+ * @license		GNU General Public License version 2 or later; see LICENSE.md
+ * @since		0.0.3
+ */
+
+use Joomla\CMS\MVC\Controller\FormController;
+
+class PartController extends FormController
+{
+
+}