运行 dart tool/build.dart 报错，找不到BuildAction

[arden]

weibodeiMac:nodebb weibo$ dart tool/build.dart Unhandled exception: ‘file:///Users/weibo/data/source/flutter/nodebb/tool/build.dart’: malformed type: line 14 pos 9: cannot resolve class ‘BuildAction’ from '::' new BuildAction( ^

#0 _TypeError._throwNew (dart:core-patch/dart:core/errors_patch.dart:84) #1 main (file:///Users/weibo/data/source/flutter/nodebb/tool/build.dart:14:9) #2 _startIsolate. (dart:isolate-patch/dart:isolate/isolate_patch.dart:277) #3 _RawReceivePortImpl._handleMessage (dart:isolate-patch/dart:isolate/isolate_patch.dart:165)

我运行 dart tool/build.dart 报错，找不到BuildAction