Email stuck in drafts folder

I use Outlook for Mac 2011. I have an email stuck in my drafts folder. When I open Outlook, the stuck email opens with this message: "Outlook has recovered the interrupted messages and saved them in your drafts folder." I then delete it from the drafts folder and quit Outlook and I get a error message which reads: Microsoft Outlook must be closed because an error occurred. Any unsaved work may be lost." When I reopen Outlook, the message is back in the drafts folder and around we go. Is there a way to correct this? Thanks!