<Format All XAML > option corrupted my WPF Solution Projects

[softinitializing]

I executed option on my Solution and then it kept opening and closing xaml files until showing error "object is not set to an instance of an object " and since then whenever I try to compile and run any app project in the solution it throws this exception on App startup

System.TypeInitializationException: 'The type initializer for '<Module>' threw an exception.'
FileNotFoundException: Could not load file or assembly 'WinRT.Runtime, Version=2.1.0.0, Culture=neutral, PublicKeyToken=99ea127f02d97709'. The system cannot find the file specified.