I have been working with Indigo since the end of last year, but I have not played with Avalon yet. Since I already have WinFX Feb CTP installed on my machine, I decided to give Avalon a try (I know I am late). I created a new project, and tried to compile it. To my surprise (maybe not), it does not compile. I received the following error: Error 1 The "Microsoft.Build.Tasks.Wind... task could not be loaded from the assembly PresentationBuildTasks, Version=3.0.51116.0, Culture=neutral, ......