How do I figure out a “DependencyProperty.UserValue” exception in my WPF/MVVM application?

I have a C#/.Net/WPF/MVVM application.

The application runs fine when running through VS 2015.

When I run the application standalone (on a different machine), I get the following exception at startup:

An unhandled exception of type "System.InvalidOperationException" occurred in WindowsBase.dll

Additional information "{DependencyProperty.UnserValue} is not a valid value for property "TopLevelItemTemplateKey"

What is really going on?

How do I debug this?

jxbmaSoftware ConsultantAsked:
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PawełI Design & Develop SoftwareCommented:
First thing you have to do is isolate what is causing the exception, try to identify the change you did that resulted in the exception and as always first thing you should do is delete the bin folder and rebuild your project.

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