preview of UserControls not working in a class library | The element "foo" could not be displayed due to missing assemblies

[D.Jonas]

I have a UWP solution with three projects:

App1 ,ClassLibrary1 and ClassLibrary2

In the App1 and ClassLibraries are each with a custom UserControl. While it's possible to get a preview (of the UserControls) in the designer of the the App1.Page1, the preview in ClassLibrary1.Page1 is not working.

I always get the following error message: The element "foo" could not be displayed due to missing assemblies

https://imgur.com/JuInWnu

View: https://i.imgur.com/JuInWnu.png

https://imgur.com/iEA3yBQ

View: https://i.imgur.com/iEA3yBQ.png



ErrorMessage:

https://imgur.com/XlFF4rb

View: https://i.imgur.com/XlFF4rb.png



Solution file:

files.dominic-jonas.de/stackoverflow/App1.zip


The following steps I tried so far (without success):

• clean solution
• rebuild project
• deleted cache
• dotnet clean
• dotnet restore
• restarted windows
• updated VisualStudio (v16.6.0) and tried v16.7.0 preview 1

Anyone know how I can get the preview fixed?


As my account is not verified, I cannot post the images..


Thanks!

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