Local C# Class Cannot be Added to Class Diagram

[maroonedsia2]

Hi,

I'm using Visual Studio 2015 for an Umbraco CMS website.

I have a very simple public ViewModel class.

I have created a class diagram file in the same folder of the project, but when I drag my VM class on it, an error message box says "one or more of the selected items cannot be added to the class diagram".

It's really strange, it's a local file, in the same folder, it's public, etc.

Can anyone please tell me what am I doing wrong?

Thanks,

Sia

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