Word VSTO Add-In on Visual Studio. Why can't I open the Ribbon Visual Designer?

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On computer "A", I successfully developed a Word VSTO Add-In using VS 2019 Enterprise using C#. Recently, I rebuilt the hard disk on computer "A". Reinstalled Windows 10 (version 1909). Reinstalled Visual Studio 2019 Enterprise (currently 16.5.5) including the Office/Sharepoint development workload.

On the rebuilt computer "A", I created a new VSTO Word Add-In project. Added a Ribbon (Visual Designer) to the project using this guide: Ribbon Designer

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When I attempt to open the designer for the Ribbon I get a no-information error message:

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No errors in the error list.

When I attempt to open the ribbon designer on the original, working VSTO add-in, same thing happens.

I have computer "B" that is configured the same as was computer "A" before I rebuilt computer "A". On computer "B", I'm able to open the ribbon designer successfully for both a new VSTO project and my original VSTO project. I compared computer "A" references to computer "B" reference and they look the same

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Also verified that Office Runtime is installed

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I assume I'm missing a reference. Anyone experience this? Any ideas?

Other things I tried: deleting \bin. Cleaned, rebuilt solution

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c#visual-studioms-wordvstowindows-forms-designer

1 Answers

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I guess it will be a mystery. I ended up rebuilding the machine a second time. The only difference was that the second time around I installed Office 2016 instead of Office 2019. I was able to open the ribbon designer just fine this time around