$ flutter channel stable
$ flutter upgrade
(If you are locked in China...终端是这么提示的。需要切换为国内镜像
$ PUB_HOSTED_URL=https://pub.flutter-io.cn
$ export FLUTTER_STORAGE_BASE_URL=https://storage.flutter-io.cn
$ git clone -b dev https://github.com/flutter/flutter.git
$ export PATH="$PWD/flutter/bin:$PATH"
$ cd ./flutter
$ flutter doctor)
$ cd 工程文件
$ flutter clean
$ flutter run -d device
可以看看这个issue，虽然flutter doctor -v还是标记为 [!]（Flutter & Darts已经安装）
但是可以用终端运行了。
Flutter issue[https://github.com/flutter/flutter/issues/6...
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本文标题：Flutter AttributeError: 'NoneTyp
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