Website Panel Error when adding Exchange Mail Box

After updating to Web Site Panel 2.1 i had a error creating exchange mail boxes on some customers. I got a error like this in the event viewer. System.Web.Services.Protocols.SoapException: Server was unable to process request. —> System.NullReferenceException: Object reference not set to an instance of an object. at WebsitePanel.EnterpriseServer.ExchangeServerController.GetMailboxSetupInstructions(Int32 itemId, Int32 accountId, Boolean pmm, Boolean […]