Show Visualizers Error “could not load this custom viewer”

Question

When I try to inspect DataSet by standard DataSet visualizer I see this error \"could not load this custom viewer\". I wrote simple dataset visualizer, but

Answer 1

Clearing Visual Studio Cache fixed it for me.

Just follow these basic steps:

Step 1: clear the Component Cache

1. Close Visual Studio (ensure devenv.exe is not present in the Task Manager)
2. Delete the directory:

%USERPROFILE%\AppData\Local\Microsoft\VisualStudio\14.0\ComponentModelCache

If step 1 doesn't work then

Step 2: cleanup your user’s temp folder. Delete this directory:

%USERPROFILE%\AppData\Local\Temp

If step 2 doesn't work then

Step 3: Delete all these directories:

%USERPROFILE%\AppData\Local\Microsoft\Team Foundation

%USERPROFILE%\AppData\Local\Microsoft\VisualStudio

%USERPROFILE%\AppData\Local\Microsoft\VSCommon

Credit : https://errorhandlinginskills.wordpress.com/2018/07/28/how-to-clear-visual-studio-cache/