how to solve NuGet problem of OpenCV or glag except Uninstall and reinstall about caffe

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错误 1 error MSB4062: 未能从程序集 E:\code\caffe-master\NugetPackages\gflags.2.1.2.1\build\native\private\coapp.NuGetNativeMSBuildTasks.dll 加载任务“NuGetPackageOverlay”。未能加载文件或程序集“file:///E:\code\caffe-master\NugetPackages\gflags.2.1.2.1\build\native\private\coapp.NuGetNativeMSBuildTasks.dll”或它的某一个依赖项。另一个程序正在使用此文件，进程无法访问。 (异常来自 HRESULT:0x80070020) 请确认 声明正确，该程序集及其所有依赖项都可用，并且该任务包含实现 Microsoft.Build.Framework.ITask 的公共类。 E:\code\caffe-master\NugetPackages\gflags.2.0.1.0\build\native\gflags.targets 346 5 libcaffe

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such as this error ，i uninstall and install glog in NuGet many times and close VS open it in Administrator Mode it still has this problem. Any one can solve it???

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when i choose windows caffe to do something, normally, i will uninstall and install glog or Opencv billion times, can it be solved?!