No FontFamily element found in FontFamilyCollection that matches current OS or greater: Windows7SP1

System.IO.FileFormatException: No FontFamily element found in FontFamilyCollection that matches current OS or greater: Windows7SP1
 
This is a Microsoft issue and will affect all .Net WPF applications running on your system.
 
Please see the following Microsoft announcement for workarounds:
'.NET Framework January 2018 Rollup Known Issue KB4074906 - "TypeInitializationException" or "FileFormatException" error in WPF applications':
 
 

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