MVC - Fix Error - Cannot save'...Models\Model1.edmx': Could not load file or assembly 'Microsoft.XmlEditor, Version=15.0.0.0, Culture=neutral, ...

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to fix error in Visual Studio 2019
Cannot save'...Models\Model1.edmx': Could not load file or assembly 'Microsoft.XmlEditor, Version=15.0.0.0, Culture=neutral, ...

delete
%LOCALAPPDATA%\Microsoft\VisualStudio\16.0_45e1ed66\ComponentModelCache

and restart Visual Studio 2019