C:\Users\Administrator\AppData\Local\Microsoft\MSBuild\v4.0下的文件需要重建。
变为
<?xml version="1.0" encoding="utf-8"?>
<Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
<ImportGroup Label="PropertySheets">
</ImportGroup>
<PropertyGroup Label="UserMacros" />
<PropertyGroup />
<ItemDefinitionGroup />
<ItemGroup />
</Project>