Problem getting started

I am trying out Windows Workflow Foundation on my VS 2005 Version 8.0.50727.7.

I created a new project using the C# Sequential workflow template.

When I try compiling, I got this warning message:
The "System.Workflow.ComponentModel.BuildTasks.CompileXomlTask" task could not be loaded from the assembly System.Workflow.ComponentModel, Version=1.0.00000.0, Culture=neutral, PublicKeyToken=71530258abd56239. Method not found: 'System.Object Microsoft.Build.Framework.ITask.get_HostObject()'. Confirm that the <UsingTask> declaration is correct, and that the assembly and all its dependencies are available.

When I click on the workflow.xoml, I was not unable to view the designer. Instead, I got this message.
"The Designer loader has not been initialized yet. You may only call this method after initialization."

Anyone seen these errors?

Do I need to install the Windows Workflow Foundation Beta?

Thanks.

[940 byte] By [Tahoo] at [2008-2-4]