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ArcGIS SDK project won't build add-ins

Question asked by PNWGIS on Jun 19, 2019
Latest reply on Jun 20, 2019 by PNWGIS

I have encountered a problem with Visual Studio giving me this error: 


An unhandled exception of type 'System.NullReferenceException' occurred in ArcGIS.Desktop.Framework.dll
Object reference not set to an instance of an object.

I am working in ArcGIS Pro 2.3.3 using ArcGIS Pro SDK 2.3


I am just trying to build a basic button from the tutorial like this one:


I download the solution to build it and I get that error.


However I can build the .NET projects:


Has anyone seen this error? I cannot build any ArcGIS Pro addins right now.