Add app/dialplan/ to the dialplan class path.

resources/install.php

@@ -1269,7 +1269,7 @@ if ($_POST["install_step"] == "3" && count($_POST) > 0 && strlen($_POST["persist
 				//print_r($install->result);
 
 			//create the dialplan/default.xml for single tenant or dialplan/domain.xml
-				require_once "resources/classes/dialplan.php";
+				require_once "app/dialplan/resources/classes/dialplan.php";
 				$dialplan = new dialplan;
 				$dialplan->domain_uuid = $_SESSION["domain_uuid"];
 				$dialplan->domain = $domain_name;