build/serve crash: Unhandled exception: Could not import file builder.dart

[afpatmin]

When trying to run command 'pub run build_runner serve' / 'pub run build_runner build',
the terminal outputs:

[INFO] Entrypoint: Generating build script completed, took 421ms
Unhandled exception:
IsolateSpawnException: Unable to spawn isolate: Unhandled exception:
Could not import "file:///X:/project/tool/src/builder.dart" 
from "file:///X:/project/.dart_tool/build/entrypoint/build.dart": 
FileSystemException: Cannot open file, path = 'X:\project\tool\src\builder.dart' 
(OS Error: Det går inte att hitta sökvägen., errno = 3)
null

The issue occured after upgrading build_runner from v 0.7.9+2 to v 0.7.10.

The project doesn't contain a build.yaml or any build.dart scripts

build_runner: 0.7.10
OS: Windows 10
SDK: 2.0.0-dev.22.0
IDE: Webstorm 2017.3.4

[afpatmin]

travis reported this too: https://travis-ci.org/dart-lang/build/jobs/339725849

[luisvt]

The error is caused because of built_value dependency. It looks like its configuration is asking to create a builder.dart file into tool/src folder. As work around I created tool/src/builder.dart containing next code:

import 'package:build/build.dart';

Builder builtValueBuilder(_) => null;

[jakemac53]

Ya this is caused by a local builder defined in code_builder which we end up trying to import even though it never applies to anything.

You can force code_builder version 3.0.1 in dependency_overrides to fix. We will come out with a fix soon as well.

[matanlurey]

Fixed by dart-lang/code_builder#198, and published as 3.0.3.

If you run pub upgrade the crashes should go away.

[jakemac53]

thanks @matanlurey, I am working on a fix in build_runner as well