Archebuddy Critical Error

[DJM]

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Critical error while working: System.MissingMethodException: Method not found: 'IntPtr System.Runtime.InteropServices.Marshal.GetFunctionPointerForDelegate(!!0)'.

   at A.c825e8f7c44b49d205379e993e4ffeec8..ctor()

   at A.c6ae055ae3b6973d7fd08ea17d0b90bb4.c5802dd289334c2ca6a250580033a259b()

   at ArcheBuddy.AppMain.Main_Encrypted$(String[] )
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OK   
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Problem Signature -

Problem signature:
  Problem Event Name:	CLR20r3
  Problem Signature 01:	updater.exe
  Problem Signature 02:	1.5.5.5
  Problem Signature 03:	5448c915
  Problem Signature 04:	ArcheBuddy
  Problem Signature 05:	1.2.1.0
  Problem Signature 06:	54500127
  Problem Signature 07:	8f2
  Problem Signature 08:	101
  Problem Signature 09:	System.MissingMethodException
  OS Version:	6.1.7600.2.0.0.256.1
  Locale ID:	1033
  Additional Information 1:	0a9e
  Additional Information 2:	0a9e372d3b4ad19135b953a78882e789
  Additional Information 3:	0a9e
  Additional Information 4:	0a9e372d3b4ad19135b953a78882e789

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  C:\Windows\system32\en-US\erofflps.txt

No idea how to fix this.

Edit: Fixed, had to install framework 4.5.1