I keep getting an error on the session login any Idea what it could be here is my vbscript code.

Set ln = CreateObject("msmapi.mapisession.1")
ln.UserName = "Darren Mc Dowell"

* && Error out here
ln.SignOn


Set lo = CreateObject("msmapi.mapimessages.1")
lo.sessionid = ln.sessionid
lo.compose()
lo.recipdisplayname = "Testing@Aol.Compose"
lo.reciptype = 1
lo.resolvename()
lo.msgsubject = "This is my Subject"
lo.msgnotetext = "This is my test"
lo.send(1)
ln.signoff()