Add missing import

Author: ThangVuNguyenViet

packages/go_router/lib/src/path_utils.dart

@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+import 'misc/errors.dart';
 import 'route.dart';
 
 final RegExp _parameterRegExp = RegExp(r':(\w+)(\((?:\\.|[^\\()])+\))?');