Invalid child element MvcBuildViews

I have an ASP.NET MVC 2 Beta app and have set <MvcBuildViews>true</MvcBuildViews>

in the property group at the top of my csproj file. But my views are not being compiled. A closer look at the .csproj file shows a squiggly under the MvcBuildViews tag and when I hover over it, it says

The element 'PropertyGroup' in namespace 'http://schemas.microsoft.com/developer/msbuild/2003' has invalid child element 'MvcBuildViews' in namespace 'http://schemas.microsoft.com/developer/msbuild/2003'. List of possible elements expected: 'Property' in namespace 'http://schemas.microsoft.com/developer/msbui开发者_运维百科ld/2003'.

What am I doing wrong?

Many elements you define in the .config are not part of that schema, but still operate. It's the same way for MSBuild scripts.

That's a custom property we include in the project files to compile views. It shouldn't cause any problems, since you can define your own properties (see http://msdn.microsoft.com/en-us/library/t4w159bs.aspx) in your project file.

For further detail, please refer to:

http://forums.asp.net/t/1506782.aspx?Error+invalid+child+element+MvcBuildViews+in+namespace

btw, this issue existed in 2009, but now is 2015, it still exists.