你点开Windows更新，进度条走到85%突然卡住，弹出一行红字：“更新失败，错误代码：0x80070020”。紧接着系统提示“无法访问该文件，因为另一个程序正在使用它”——这行提示才是关键。

The build step will result in an error if the output directory is missing, empty, or invalid (for example, it is not a directory). To resolve this error, you can try ...