I am attempting to install "Microsoft.AspNet.Web.Optimization.WebForms" from Nuget Package Manager Console. All seemed to have gone well but I did receive the following message in red, in the middle of the "install dialog" in the Package Manager Console:
------------------------------------------------------------------------------------
Successfully added 'WebGrease 1.5.2' to Site.
You cannot call a method on a null-valued expression.
At C:\BegASPNET\Site\packages\WebGrease.1.5.2\tools\i nstall.ps1:45 char:29
+ $msbuild.Xml.AddProperty <<<< ("WebGreaseLibPath", $relativePackageUri.ToString().Replace([System.IO.Path]::AltDirectorySeparatorChar, [System.IO.Pa
th]::DirectorySeparatorChar))
+ CategoryInfo : InvalidOperation: (AddProperty:String) [], RuntimeException
+ FullyQualifiedErrorId : InvokeMethodOnNull
-----------------------------------------------------------------------------------
Does this represent a problem? If so, is there a solution?

Best Regards
Tip Tyler

Hi there,

I've never seen that error before when installing that package, but maybe this helps? http://stackoverflow.com/questions/2...b-grease-1-5-1

Imar

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Author of Beginning ASP.NET 4.5 : in C# and VB, Beginning ASP.NET Web Pages with WebMatrix
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