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Flutter Setup: Running pub upgrade.. Flutter Setup:Building

打开vs code后一直显示 Flutter Setup: Running pub upgrade..  Flutter Setup:Building flutter tool...   
flutter doctor也失败,提示   :Building flutter tool... Running pub upgrade... 系统找不到指定的路径

解决办法:
删除 flutter/bin 下的cache文件夹  ,然后再去 flutter doctor