type or namespace name 'Framework' could not be found

Question

Hi,

I'm getting this error when i go to build my project:

The type or namespace name 'Framework' could not be found (are you missing a using directive or an assembly reference?)

I did not write the class, It's written by microsoft, part of the DX SDK. The class is called 'dxmutmisc.cs' the error is on line 2189.

The error refers to this, As you can see 'Framework' is a type:

public static void DisplaySwitchingToRefWarning(Framework framework, string sampleTitle) {
 
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I have no idea what reference i need to add, guess work is not getting me anywhere....
Any help would be appreciated.