Stuck Downloading Notification

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http://androidforums.com – Hey guys.. This problem is troubling me for over a week now. I was downloading a small pdf file from my gmail app. The file didnt download and the notification continues to show and this "continuous" downloading eats up my battery completely. The file is not showing in my downloads folder/app that comes in my Galaxy S2. I cleared cache and data of my gmail but the "downloading" notification just wont go. I have heard few peaople having the same problem and they ended up factory resetting the phone. I dont want to do that. Is there a solution?? Thanks (General)