The type or namespace name 'Optimization' does not exist in the namespace 'System.Web' (are you missing an assembly reference?)
Install Microsoft ASP.NET Web Optimization Framework 1.0.0 ( http://nuget.org/packages/Microsoft.AspNet.Web.Optimization/1.0.0)
From the Tools menu, select Library Package Manager and then click Package Manager Console.>
Install-Package Microsoft.AspNet.Web.Optimization -Version 1.0.0
Error description:
The "GenerateResource" task failed unexpectedly.
System.TypeInitializationException: The type initializer for 'Microsoft.Build.Utilities.FileTracker' threw an exception. ---> System.NullReferenceException: Object reference not set to an instance of an object.
at Microsoft.Build.Utilities.FileTracker..cctor()
--- End of inner exception stack trace ---
at Microsoft.Build.Utilities.FileTracker.ForceOutOfProcTracking(ExecutableType toolType, String dllName, String cancelEventName)
at Microsoft.Build.Tasks.GenerateResource.Execute()
at Microsoft.Build.BackEnd.TaskExecutionHost.Microsoft.Build.BackEnd.ITaskExecutionHost.Execute()
at Microsoft.Build.BackEnd.TaskBuilder.ExecuteInstantiatedTask(ITaskExecutionHost taskExecutionHost, TaskLoggingContext taskLoggingContext, TaskHost taskHost, ItemBucket bucket, TaskExecutionMode howToExecuteTask, Boolean& taskResult) umbraco.presentation
Solution:
Refers to Microsoft.NET Framework v4.0.30319
Go to directory C:\Windows\Microsoft.NET\Framework\v4.0.30319\Microsoft.Common.targets(Preferably -Open the file with Notepad)
Search for <PropertyGroup> , and then set <TrackFileAccess> to false