任务请求启动 .NET 3.5 版本的 MSBuild 任务宿主，但此计算机上没有安装 .NET 3.5，因此无法启动该任务宿主。若要修复此错误，请安装 .NET 3.5 或者重新设定项目目标。

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A task requested launch of the .NET 3.5 version of the MSBuild task host, but .NET 3.5 is not installed on this machine so the task host could not be launched. To fix this error, please either install .NET 3.5 or retarget your project.

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