Using Mapi Controls

I'm using Visual Basic 6.0. In a standard EXE Project I used Mapi Controls to view and send Mails. The following code I used to sign on.

With mas_Sess
.DownLoadMail = False
.UserName = "sujatha"
.PassWord = "sujatha"
.SignOn
.NewSession = True
mme_Message.SessionID = .SessionID
End With
mme_Message.FetchUnreadOnly = True
mme_Message.Fetch

While executing the line mme_Message.Fetch the following Error occurs
"Run-time error '32002'
Unspecified Failure has occurred"
What is the problem? Thanks for any help.

Regards
Sujatha.