System.InvalidOperationException

[SmUrF3R5]

I get this error when running this tool on Server 2012 on either Single Hop or Pass through options just after this

Windows authentication is enabled...(RECOMMENDED)

Error

System.InvalidOperationException: Element not found!
at KerberosConfigMgr.Kerberos.button2_Click(Object sender, EventArgs e)

I have the same error