Unhandled Exception:
System.TypeInitializationException: The type initializer for 'VRage.FileSystem.MyFileSystem' threw an exception. ---> System.MissingMethodException: Method 'HashHelpers.IsWellKnownEqualityComparer' no  at System.Collections.Generic.HashSet`1[T].Add (System.Collections.Generic.T item) <0x3ce7dc0 + 0x0001c> in <filename unknown>:0
  at VRage.FileSystem.MyFileProviderAggregator.AddProvider (IFileProvider provider) <0x3ce7d60 + 0x0002d> in <filename unknown>:0
  at VRage.FileSystem.MyFileProviderAggregator..ctor (VRage.FileSystem.IFileProvider[] providers) <0x3ce6a10 + 0x000b6> in <filename unknown>:0
  at VRage.FileSystem.MyFileSystem..cctor () <0x3ce0960 + 0x001a0> in <filename unknown>:0
  --- End of inner exception stack trace ---
  at SpaceEngineers.MyProgram.Main (System.String[] args) <0x3cd4440 + 0x000d7> in <filename unknown>:0
[ERROR] FATAL UNHANDLED EXCEPTION: System.TypeInitializationException: The type initializer for 'VRage.FileSystem.MyFileSystem' threw an exception. ---> System.MissingMethodException: Method 'HashHelp  at System.Collections.Generic.HashSet`1[T].Add (System.Collections.Generic.T item) <0x3ce7dc0 + 0x0001c> in <filename unknown>:0

  at VRage.FileSystem.MyFileProviderAggregator.AddProvider (IFileProvider provider) <0x3ce7d60 + 0x0002d> in <filename unknown>:0

  at VRage.FileSystem.MyFileProviderAggregator..ctor (VRage.FileSystem.IFileProvider[] providers) <0x3ce6a10 + 0x000b6> in <filename unknown>:0

  at VRage.FileSystem.MyFileSystem..cctor () <0x3ce0960 + 0x001a0> in <filename unknown>:0

  --- End of inner exception stack trace ---

  at SpaceEngineers.MyProgram.Main (System.String[] args) <0x3cd4440 + 0x000d7> in <filename unknown>:0