System.ArgumentException: WSE2351: Incorrect size for key material, expected 16 bytes.
   at Microsoft.Web.Services3.Security.Cryptography.AES.set_KeyBytes(Byte[] value)
   at Microsoft.Web.Services3.Security.Tokens.KerberosToken.InitializeKey()
   at Microsoft.Web.Services3.Security.Tokens.KerberosToken.get_Key()
   at Microsoft.Web.Services3.Security.MessageSignature..ctor(SecurityToken token)
   at Microsoft.Web.Services3.Design.MessageProtectionRequirements.Sign(SoapEnvelope envelope, Security security ...)
   at Microsoft.Web.Services3.Design.MessageProtectionRequirements.Protect(SoapEnvelope envelope, Security security ...)
   at Microsoft.Web.Services3.Design.KerberosAssertion.ClientOutputFilter.SecureMessage(SoapEnvelope envelope, Security security ...)
   at Microsoft.Web.Services3.Security.SecureConversationClientSendSecurityFilter.SecureMessage(
SoapEnvelope envelope, Security security)
   at Microsoft.Web.Services3.Security.SendSecurityFilter.ProcessMessage(SoapEnvelope envelope)
   at Microsoft.Web.Services3.Pipeline.ProcessOutputMessage(SoapEnvelope envelope)
   at Microsoft.Web.Services3.Xml.SoapEnvelopeWriter.Finish()
   at Microsoft.Web.Services3.Xml.XmlWrappingWriter.Flush()
   at System.Web.Services.Protocols.SoapHttpClientProtocol.Serialize(SoapClientMessage message)
   at System.Web.Services.Protocols.SoapHttpClientProtocol.Invoke(String methodName, Object[] parameters)
   at KerberosClient.KerberosWS.SecureKerberosTestWse.HelloWorld()