Use __dir__ to find resources/require.php

core/upgrade/upgrade_schema.php

@@ -37,12 +37,8 @@
 		$format = 'text'; //html, text
 	}
 	else if (!$included) {
-		//set the include path
-		$conf = glob("{/usr/local/etc,/etc}/fusionpbx/config.conf", GLOB_BRACE);
-		set_include_path(parse_ini_file($conf[0])['document.root']);
-
 		//includes files
-		require_once "resources/require.php";
+		require_once dirname(__DIR__, 2) . "/resources/require.php";
 		require_once "resources/check_auth.php";
 		if (permission_exists('upgrade_schema') || if_group("superadmin")) {
 			//echo "access granted";