DB Mail And Notify Operator Through DB Mail Error Could Not Retrieve Item From The Queue

I've set up DB mail and sent a test e-mail and that comes through fine.

I set up an Operator with email Name: DWhelpton@k-and-s.com;MWeaver@k-and-s.com

I created a job and set up the notifications to e-mail the operator on failure.

When the job runs and fails, I do not get an e-mail and I get the following exception in the db mail log:

Date 2/2/2007 8:35:00 AM
Log Database Mail (Database Mail Log)

Log ID 402
Process ID 3936
Last Modified 2/2/2007 8:35:00 AM
Last Modified By NT AUTHORITYSYSTEM

Message
1) Exception Information
===================
Exception Type: Microsoft.SqlServer.Management.SqlIMail.Server.Common.BaseException
Message: Could not retrieve item from the queue.
Data: System.Collections.ListDictionaryInternal
TargetSite: Microsoft.SqlServer.Management.SqlIMail.Server.Controller.ICommand CreateSendMailCommand(Microsoft.SqlServer.Management.SqlIMail.Server.DataAccess.DBSession)
HelpLink: NULL
Source: DatabaseMailEngine

StackTrace Information
===================
at Microsoft.SqlServer.Management.SqlIMail.Server.Controller.CommandFactory.CreateSendMailCommand(DBSession dbSession)
at Microsoft.SqlServer.Management.SqlIMail.Server.Controller.CommandFactory.CreateCommand(DBSession dbSession)
at Microsoft.SqlServer.Management.SqlIMail.Server.Controller.CommandRunner.Run(DBSession db)
at Microsoft.SqlServer.Management.SqlIMail.IMailProcess.ThreadCallBack.MailOperation(Object o)


What step am I missing?