flutter 1.20.0 build not success

[ghost]

info:

Precompiling executable...
Precompiled build_runner:build_runner.
[INFO] Generating build script...
[INFO] Generating build script completed, took 472ms

[INFO] Creating build script snapshot......
[INFO] Creating build script snapshot... completed, took 18.3s

[INFO] Initializing inputs
[INFO] Building new asset graph...
[INFO] Building new asset graph completed, took 974ms

[INFO] Checking for unexpected pre-existing outputs....
[INFO] Checking for unexpected pre-existing outputs. completed, took 2ms

[INFO] Running build...
[INFO] Generating SDK summary...
[SEVERE] json_serializable:json_serializable on test/widget_test.dart:

Bad state: Unexpected diagnostics:
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:119:41 - This requires the 'non-nullable' language feature to be enabl
ed.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:152:17 - This requires the 'non-nullable' language feature to be enabl
ed.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:88:62 - This requires the 'non-nullable' language feature to be enable
d.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:153:38 - This requires the 'non-nullable' language feature to be enabl
ed.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:186:51 - This requires the 'non-nullable' language feature to be enabl
ed.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:133:32 - This requires the 'non-nullable' language feature to be enabl
ed.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:154:25 - This requires the 'non-nullable' language feature to be enabl
ed.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:18:17 - This requires the 'non-nullable' language feature to be enable
d.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:64:4 - This requires the 'non-nullable' language feature to be enabled
.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:168:32 - This requires the 'non-nullable' language feature to be enabl
ed.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:47:14 - This requires the 'non-nullable' language feature to be enable
d.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:159:38 - This requires the 'non-nullable' language feature to be enabl
ed.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:132:37 - This requires the 'non-nullable' language feature to be enabl
ed.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:118:48 - This requires the 'non-nullable' language feature to be enabl
ed.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:19:11 - This requires the 'non-nullable' language feature to be enable
d.
[SEVERE] json_serializable:json_serializable on test/widget_test.dart:

Bad state: Unexpected diagnostics:
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:119:41 - This requires the 'non-nullable' language feature to be enabl
ed.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:152:17 - This requires the 'non-nullable' language feature to be enabl
ed.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:88:62 - This requires the 'non-nullable' language feature to be enable
d.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:153:38 - This requires the 'non-nullable' language feature to be enabl
ed.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:186:51 - This requires the 'non-nullable' language feature to be enabl
ed.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:133:32 - This requires the 'non-nullable' language feature to be enabl
ed.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:154:25 - This requires the 'non-nullable' language feature to be enabl
ed.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:18:17 - This requires the 'non-nullable' language feature to be enable
d.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:64:4 - This requires the 'non-nullable' language feature to be enabled
.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:168:32 - This requires the 'non-nullable' language feature to be enabl
ed.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:47:14 - This requires the 'non-nullable' language feature to be enable
d.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:159:38 - This requires the 'non-nullable' language feature to be enabl
ed.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:132:37 - This requires the 'non-nullable' language feature to be enabl
ed.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:118:48 - This requires the 'non-nullable' language feature to be enabl
ed.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:19:11 - This requires the 'non-nullable' language feature to be enable
d.
[SEVERE] json_serializable:json_serializable on test/widget_test.dart:

Bad state: Unexpected diagnostics:
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:119:41 - This requires the 'non-nullable' language feature to be enabl
ed.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:152:17 - This requires the 'non-nullable' language feature to be enabl
ed.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:88:62 - This requires the 'non-nullable' language feature to be enable
d.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:153:38 - This requires the 'non-nullable' language feature to be enabl
ed.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:186:51 - This requires the 'non-nullable' language feature to be enabl
ed.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:133:32 - This requires the 'non-nullable' language feature to be enabl
ed.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:154:25 - This requires the 'non-nullable' language feature to be enabl
ed.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:18:17 - This requires the 'non-nullable' language feature to be enable
d.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:64:4 - This requires the 'non-nullable' language feature to be enabled
.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:168:32 - This requires the 'non-nullable' language feature to be enabl
ed.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:47:14 - This requires the 'non-nullable' language feature to be enable
d.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:159:38 - This requires the 'non-nullable' language feature to be enabl
ed.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:132:37 - This requires the 'non-nullable' language feature to be enabl
ed.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:118:48 - This requires the 'non-nullable' language feature to be enabl
ed.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:19:11 - This requires the 'non-nullable' language feature to be enable
d.
[SEVERE] json_serializable:json_serializable on test/widget_test.dart:

Bad state: Unexpected diagnostics:
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:119:41 - This requires the 'non-nullable' language feature to be enabl
ed.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:152:17 - This requires the 'non-nullable' language feature to be enabl
ed.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:88:62 - This requires the 'non-nullable' language feature to be enable
d.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:153:38 - This requires the 'non-nullable' language feature to be enabl
ed.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:186:51 - This requires the 'non-nullable' language feature to be enabl
ed.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:133:32 - This requires the 'non-nullable' language feature to be enabl
ed.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:154:25 - This requires the 'non-nullable' language feature to be enabl
ed.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:18:17 - This requires the 'non-nullable' language feature to be enable
d.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:64:4 - This requires the 'non-nullable' language feature to be enabled
.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:168:32 - This requires the 'non-nullable' language feature to be enabl
ed.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:47:14 - This requires the 'non-nullable' language feature to be enable
d.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:159:38 - This requires the 'non-nullable' language feature to be enabl
ed.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:132:37 - This requires the 'non-nullable' language feature to be enabl
ed.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:118:48 - This requires the 'non-nullable' language feature to be enabl
ed.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:19:11 - This requires the 'non-nullable' language feature to be enable
d.
[SEVERE] json_serializable:json_serializable on test/widget_test.dart:

Bad state: Unexpected diagnostics:
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:119:41 - This requires the 'non-nullable' language feature to be enabl
ed.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:152:17 - This requires the 'non-nullable' language feature to be enabl
ed.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:88:62 - This requires the 'non-nullable' language feature to be enable
d.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:153:38 - This requires the 'non-nullable' language feature to be enabl
ed.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:186:51 - This requires the 'non-nullable' language feature to be enabl
ed.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:133:32 - This requires the 'non-nullable' language feature to be enabl
ed.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:154:25 - This requires the 'non-nullable' language feature to be enabl
ed.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:18:17 - This requires the 'non-nullable' language feature to be enable
d.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:64:4 - This requires the 'non-nullable' language feature to be enabled
.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:168:32 - This requires the 'non-nullable' language feature to be enabl
ed.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:47:14 - This requires the 'non-nullable' language feature to be enable
d.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:159:38 - This requires the 'non-nullable' language feature to be enabl
ed.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:132:37 - This requires the 'non-nullable' language feature to be enabl
ed.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:118:48 - This requires the 'non-nullable' language feature to be enabl
ed.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:19:11 - This requires the 'non-nullable' language feature to be enable
d.
[SEVERE] json_serializable:json_serializable on test/widget_test.dart:

Bad state: Unexpected diagnostics:
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:119:41 - This requires the 'non-nullable' language feature to be enabl
ed.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:152:17 - This requires the 'non-nullable' language feature to be enabl
ed.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:88:62 - This requires the 'non-nullable' language feature to be enable
d.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:153:38 - This requires the 'non-nullable' language feature to be enabl
ed.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:186:51 - This requires the 'non-nullable' language feature to be enabl
ed.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:133:32 - This requires the 'non-nullable' language feature to be enabl
ed.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:154:25 - This requires the 'non-nullable' language feature to be enabl
ed.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:18:17 - This requires the 'non-nullable' language feature to be enable
d.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:64:4 - This requires the 'non-nullable' language feature to be enabled
.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:168:32 - This requires the 'non-nullable' language feature to be enabl
ed.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:47:14 - This requires the 'non-nullable' language feature to be enable
d.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:159:38 - This requires the 'non-nullable' language feature to be enabl
ed.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:132:37 - This requires the 'non-nullable' language feature to be enabl
ed.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:118:48 - This requires the 'non-nullable' language feature to be enabl
ed.
E:\language\flutter_src\flutter_windows_1.20.0-stable\flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:19:11 - This requires the 'non-nullable' language feature to be enable
d.
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[WARNING] No actions completed for 15.0s, waiting on:
  - json_serializable:json_serializable on lib/data/user.dart
  - json_serializable:json_serializable on lib/main.dart
  - json_serializable:json_serializable on lib/page/home_page.dart
  - json_serializable:json_serializable on lib/model/auth_model.dart
  - json_serializable:json_serializable on lib/page/login_page.dart

[INFO] 17.8s elapsed, 1/6 actions completed.
[INFO] 18.9s elapsed, 1/6 actions completed.

[bakua]

I was able to get around it having this dependency settings:

dev_dependencies:
  build_runner: 1.10.1

dependency_overrides:
  build_resolvers: 1.3.10

My pubspec.lock file:

analyzer
    version: "0.39.14"
build_resolvers
    version: "1.3.10"
build_runner
    version: "1.10.1"

[woshikie]

Probably related to dart-lang/build#2763 and #684 .

I was able to get around it having this dependency settings:

dev_dependencies:
  build_runner: 1.10.1

dependency_overrides:
  build_resolvers: 1.3.10

My pubspec.lock file:

analyzer
    version: "0.39.14"
build_resolvers
    version: "1.3.10"
build_runner
    version: "1.10.1"

the overrides helps me to build too, albeit only on stable channel. Build is still failing on dev channel for me

[ghost]

ok, thank you