Halo Online Dewrito Updater Crash Text

Problem signature:
  Problem Event Name:	CLR20r3
  Problem Signature 01:	dewritoupdater.exe
  Problem Signature 02:	1.0.0.0
  Problem Signature 03:	5698272d
  Problem Signature 04:	MahApps.Metro
  Problem Signature 05:	1.1.3.127
  Problem Signature 06:	55b12d82
  Problem Signature 07:	92b
  Problem Signature 08:	34
  Problem Signature 09:	System.MissingMethodException
  OS Version:	6.1.7601.2.1.0.768.3
  Locale ID:	2057
  Additional Information 1:	90c7
  Additional Information 2:	90c7d84072d5b28704291153aaef1e27
  Additional Information 3:	d1bc
  Additional Information 4:	d1bc7264f753f4a69ecdf3a598cfe920