Visual Studio 2019 Dataset Designer Error: Value cannot be null. Parameter name:instance

[Gene Porubsky]

I have opened an existing project in VS 2109. When trying to open any data set I get the following error.

Value cannot be null. Parameter name:instance

Call Stack:

at System.ComponentModel.TypeDescriptor.AddAttributes(Object instance, Attribute[] attributes)
at Microsoft.VisualStudio.Design.VSDesignSurface.CreateDesigner(IComponent component, Boolean rootDesigner)
at System.ComponentModel.Design.DesignerHost.AddToContainerPostProcess(IComponent component, String name, IContainer containerToAddTo)
at System.ComponentModel.Design.DesignerHost.PerformAdd(IComponent component, String name)
at System.ComponentModel.Design.DesignerHost.Add(IComponent component, String name)
at System.ComponentModel.Container.Add(IComponent component)
at Microsoft.VSDesigner.DataSource.Designer.DataSourceDesignerLoader.HandleLoad(IDesignerSerializationManager serializationManager)
at Microsoft.VSDesigner.DesignerFramework.BaseDesignerLoader.PerformLoad(IDesignerSerializationManager serializationManager)
at Microsoft.VSDesigner.DesignerFramework.BaseDesignerLoader.Microsoft.VisualStudio.TextManager.Interop.IVsTextBufferDataEvents.OnLoadCompleted(Int32 fReload)

I have tried changing the target Framework. Did not help.

Any suggestions?

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