Microsoft Visual Studio designer cannot open and reports the error "The designer could not be shown for this file because none of the classes within it can be designed."

I had a problem today whereby I couldn't open the Visual Studio form designer and received the following error viewing any form or user control.

The designer could not be shown for this file because none of the classes within it can be designed. 

at System.ComponentModel.Design.Serialization.CodeDomDesignerLoader.EnsureDocument(IDesignerSerializationManager manager)

at System.ComponentModel.Design.Serialization.CodeDomDesignerLoader.PerformLoad(IDesignerSerializationManager manager)

at

Microsoft.VisualStudio.Design.Serialization.CodeDom.VSCodeDomDesignerLoader.PerformLoad(IDesignerSerializationManager serializationManager)

at Microsoft.VisualStudio.Design.Serialization.CodeDom.VSCodeDomDesignerLoader.DeferredLoadHandler.Microsoft.VisualStudio.TextManager.Interop.IVsTextBufferDataEvents.OnLoadCompleted(Int32 fReload) 


The solution was to rename the ProjectAssemblies directory in the appropriate Visual Studio directory and reopen the project. It seems there was some kind of issue with the project assemblies cache.

%LOCALAPPDATA%\Microsoft\VisualStudio\16.0_72ecbfa4\ProjectAssemblies

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