( derry watch ) Can not generate freezed classes

[jayeshinfiraise]

In Terminal : derry clean
In Terminal : derry watch

flutter_boilerplate@1.0.0+1 watch
$ flutter pub run build_runner watch --delete-conflicting-outputs

Unhandled exception:
Bad state: Unable to generate package graph, no .../Flutter-master/.dart_tool/flutter_gen/pubspec.yaml found.
#0 _pubspecForPath (package:build_runner_core/src/package_graph/package_graph.dart:232:5)
#1 _parsePackageDependencies (package:build_runner_core/src/package_graph/package_graph.dart:206:21)
#2 PackageGraph.forPath (package:build_runner_core/src/package_graph/package_graph.dart:101:33)

#3 main (file:///Users/.pub-cache/hosted/pub.dev/build_runner-2.3.3/bin/build_runner.dart:27:30)

//------------------------------------------------
I'm Using

derry --version === 1.5

flutter --version
'Flutter 3.7.5 • channel stable • https://github.com/flutter/flutter.git
Framework • revision c07f788888 (3 months ago) • 2023-02-22 17:52:33 -0600
Engine • revision 0f359063c4
Tools • Dart 2.19.2 • DevTools 2.20.1