Troubleshoot MMC has detected an error in a snap-in and will unload it

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As a note, we have not seen this issue with 32-bit snap-ins.  To confirm this, you can launch 32-bit snap-ins with the following syntax:
mmc.exe /32 snap-in.msc
OR
This issue might occur if there is an incorrect setting in one of the following registry subkeys:

•HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersionExplorerUser Shell Folders

•HKEY_LOCAL_MACHINESoftwareMicrosoftWindowsCurrentVersionExplorerUser Shell Folders

In my case, the HKCU value "Personal" was emtpy. 
After I changed the value into %USERPROFILE%Documents the problem was solved!
OR
MMC (as administrator)
File -> Add snap-in
Add: Task scheduler (from the list at left)
Pop up: Local computer
Double click on "Task Scheduler".
It works!!!
OR
across this issue. There is missing data for Type in registry
HKLM\Software\Microsoft\MMC\Snapins\FX:{8b6499ed-0241-e032-6508-da4b1c879d7e}\Type.
The value for missing data should be
Microsoft.UpdateServices.UI.SnapIn.Common.SnapInManager, Microsoft.UpdateServices.UI.SnapIn, Version=3.1.6001.1, Culture=neutral, PublicKeyToken=31bf3856ad364e35
---
Same error while opening ‘Windows Firewall with Advanced Security’
FX:{b05566ac-fe9c-4368-be02-7a4cbb7cbe11}
Snap-in Unavailable

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