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Editorial Team
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Asked: 2026-06-15T17:08:32+00:00

I’m getting this error whenever I update some file and the build.dart runs: build.dart

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I’m getting this error whenever I update some file and the build.dart runs:

build.dart --changed=web\index.html
file:/C:/Users/Fernando/dart/ACIMReader/build.dart
build.dart returned error code 255

Unhandled exception:
FormatException: Could not find an option named "machine".
#0      ArgParser._validate (package:args/args.dart:349:21)
#1      ArgParser._parseLongOption (package:args/args.dart:488:16)
#2      ArgParser.parse (package:args/args.dart:313:27)
#3      _processArgs (package:web_components/component_build.dart:99:26)
#4      build (package:web_components/component_build.dart:34:26)
#5      main (file:///C:/Users/Fernando/dart/ACIMReader/build.dart:5:8)
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1 Answer

  1. Editorial Team

    The editor recently started adding a --machine flag so that build scripts would know to output machine readable messages. web_components added support for the flag last week, have you run pub update?

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