Referencing OpenWebKitSharp to use WebKit in C#

I am trying to reference OpenWebKitSharp, the C# library for WebKit. However, I keep getting an error on compiling: "The type or namespace WebKitBrowser does not exist in the namespac开发者_开发问答e WebKit". I am trying to follow the directions at http://code.google.com/p/open-webkit-sharp/ but I do not know what this means: Copy the contents of the cairo build to your debug/release folder.

What is a cairo build? Why do I keep getting this error even though I am referencing both WebKit.Interop and OpenWebKitSharp? On a similar note, is there a good site for documentation about the OpenWebKitSharp library?

If you are using .Net Framework Client Profile, change it to .Net Framework 4