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Error (-6209, 0), Microsoft .NET CAS Policy Manager has encountered a problem and needs to close

When trying to open a data file or when launching QuickBooks you see:

Error (-6209,-0) Microsoft .NET CAS Policy Manager has encountered a problem and needs to close. We are sorry for any inconvenience this may cause.
 

Why this is happening

This issue is caused by a damaged component of Microsoft .NET Framework

How to fix it

Solution : Repair the .NET Framework

Note: If you are not comfortable repairing the .NET framework of your computer, please consult an I.T. Professional or Microsoft for further help.

KB ID# SLN41275
12/7/2016 6:07:58 PM
QYPPRDQBKSWS01 9138 Pro 2017 5cf0a4