I am writing a webservice, that when called should build a C# project. I'm using the framework 2 reference, Microsoft.Buld.Engine and Microsoft.Build.Framework. If you look under the '<Import>' section .csproj file, by default it has:

<Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />

which I then changed to:

<Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />

My code to build the csproj is:

 Engine buildEngine = new Engine(Path.Combine(Environment.GetEnvironmentVariable("SystemRoot"), @"Microsoft.NET\Framework\v2.0.50727"));
 FileLogger logger = new FileLogger();
 logger.Parameters = @"logfile=c:\temp\build.log";
 buildEngine.RegisterLogger(logger);

 bool success = buildEngine.BuildProjectFile([Path_Of_Directory]+ "ProjectName.csproj");
 buildEngine.UnregisterAllLoggers();

The success variable returns a false because the build faild. I then check the build.log file and this is the error I recieve:

*Build started 3/17/2010 11:16:56 AM. ______________________________ Project "[Path_Of_Directory]\ProjectName.csproj" (default targets): Target GetFrameworkPaths: Could not locate the .NET Framework SDK. The task is looking for the path to the .NET Framework SDK at the location specified in the SDKInstallRootv2.0 value of the registry key HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft.NETFramework. You may be able to solve the problem by doing one of the following: 1.) Install the .NET Framework SDK. 2.) Manually set the above registry key to the correct location. Target*

I cant understand why it wont build. Any help will be much appreciated. Thanks