How can I fix the Microsoft Visual Studio error: “package did not load correctly”?

I started to see this on a fresh Windows and Visual Studio 2013 Ultimate with Update 2 installation (although others have also reported it on Updates 3 and 4, as well as the Professional version).

To resolve the problem, close all Visual Studio instances, then delete all files in the following folder:

Visual Studio 2013

%localappdata%\Microsoft\VisualStudio\12.0\ComponentModelCache

It worked fine for me. Thanks to this article.

Visual Studio 2015

%localappdata%\Microsoft\VisualStudio\14.0\ComponentModelCache

Visual Studio 2017

%localappdata%\Microsoft\VisualStudio\15.0_xxxx\ComponentModelCache

Visual Studio 2019

%localappdata%\Microsoft\VisualStudio\16_xxxx\ComponentModelCache

Visual Studio 2022

%localappdata%\Microsoft\VisualStudio\17_xxxx\ComponentModelCache

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