flutter upgrade 报错424

执行更新：

1	flutter upgrade

报错如下：

This is an unexpected error. Please run

1	pub --trace upgrade --verbosity=error --no-packages-dir

and include the logs in an issue on https://github.com/dart-lang/pub/issues/new
Error: Unable to ‘pub upgrade’ flutter tool. Retrying in five seconds… (1 tries left)
Command ‘pub upgrade’ still failed after 10 tries, giving up.

解决方式：

卸载flutter SDK 重新安装

//配置环境变量

1	vim ~/.bash_profile

1 2	export PUB_HOSTED_URL=https://pub.flutter-io.cn export FLUTTER_STORAGE_BASE_URL=https://storage.flutter-io.cn

1	source .bash_profile

//下载SDK

1	git clone -b dev https://github.com/flutter/flutter.git

//配置SDK的环境变量

1	export PATH="$PWD/flutter/bin:$PATH"

安装

1 2	cd ./flutter flutter doctor

备注：执行flutter doctor的时候，可能会报上面同样的错误，耐心等待一下，挂梯子，重新执行

xcode工具链有问题的

brew update
        brew uninstall --ignore-dependencies libimobiledevice
        brew uninstall --ignore-dependencies usbmuxd
        brew install --HEAD usbmuxd
        brew unlink usbmuxd
        brew link usbmuxd
        brew install --HEAD libimobiledevice
        brew install ideviceinstaller

flutter upgrade 报错424

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