Missing code from class diagrams, auto-repair fails?

Okay, this is driving me nuts: I have a Visual Studio project with couple of class diagrams which apparently are "broken". When I open them, I get this prompt:

I click "Yes", and Visual Studio does its thing - it takes a moment, maybe 10-20 seconds. Problem is this happens every single time I close and open the diagram!

Any sug开发者_运维问答gestions?

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I suggest you delete that class diagram and create a new one...