HelpProblem with Darky's Key Changer! {HELP}

So every time I try and use Darky's Key Changer to change my key i get this error!

Can someone please help me resolve this problem please!

Do the opposite

http://www.mpgh.net/forum/624-dayz-h...keys-back.html

Are you running as an administrator? Or whatever keystealer you downloaded fuck up your permissions.