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Flutter build web するだけで謎のエラー（恐怖だった）
普通に謎のエラー
エラー内容
xxx@MacBook-Air app % flutter build web
Target web_release_bundle failed: IconTreeShakerException: Font subsetting failed with exit code -9.
To disable icon tree shaking, pass --no-tree-shake-icons to the requested flutter build command
#0 IconTreeShaker.subsetFont (package:flutter_tools/src/build_system/targets/icon_tree_shaker.dart:208:7)
<asynchronous suspension>
#1 copyAssets.<anonymous closure> (package:flutter_tools/src/build_system/targets/assets.dart:127:25)
<asynchronous suspension>
#2 Future.wait.<anonymous closure> (dart:async/future.dart:525:21)
<asynchronous suspension>
#3 copyAssets (package:flutter_tools/src/build_system/targets/assets.dart:105:3)
<asynchronous suspension>
#4 WebReleaseBundle.build (package:flutter_tools/src/build_system/targets/web.dart:385:29)
<asynchronous suspension>
#5 _BuildInstance._invokeInternal (package:flutter_tools/src/build_system/build_system.dart:847:9)
<asynchronous suspension>
#6 Future.wait.<anonymous closure> (dart:async/future.dart:525:21)
<asynchronous suspension>
#7 _BuildInstance.invokeTarget (package:flutter_tools/src/build_system/build_system.dart:785:32)
<asynchronous suspension>
#8 FlutterBuildSystem.build (package:flutter_tools/src/build_system/build_system.dart:614:16)
<asynchronous suspension>
#9 WebBuilder.buildWeb (package:flutter_tools/src/web/compile.dart:81:34)
<asynchronous suspension>
#10 BuildWebCommand.runCommand (package:flutter_tools/src/commands/build_web.dart:191:5)
<asynchronous suspension>
#11 FlutterCommand.run.<anonymous closure> (package:flutter_tools/src/runner/flutter_command.dart:1336:27)
<asynchronous suspension>
#12 AppContext.run.<anonymous closure> (package:flutter_tools/src/base/context.dart:150:19)
<asynchronous suspension>
#13 CommandRunner.runCommand (package:args/command_runner.dart:212:13)
<asynchronous suspension>
#14 FlutterCommandRunner.runCommand.<anonymous closure> (package:flutter_tools/src/runner/flutter_command_runner.dart:296:9)
<asynchronous suspension>
#15 AppContext.run.<anonymous closure> (package:flutter_tools/src/base/context.dart:150:19)
<asynchronous suspension>
#16 FlutterCommandRunner.runCommand (package:flutter_tools/src/runner/flutter_command_runner.dart:244:5)
<asynchronous suspension>
#17 run.<anonymous closure>.<anonymous closure> (package:flutter_tools/runner.dart:91:9)
<asynchronous suspension>
#18 AppContext.run.<anonymous closure> (package:flutter_tools/src/base/context.dart:150:19)
<asynchronous suspension>
#19 main (package:flutter_tools/executable.dart:91:3)
<asynchronous suspension>
Compiling lib/main.dart for the Web... 39.8s
Exception: Failed to compile application for the Web.
解決策
flutter build web --no-tree-shake-icons
マジで訳分からん
参考
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