stock app Clock forcecloses

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http://forum.xda-developers.com – first of all I'm not rooted. I'm completely stock and I have been using the clock app ever since I got this phone. today all of sudden when I tried to open it, it foreclosed. I restarted the device but I keep having the same problem. "unfortunately, clock has stopped." is the msg I get. yesterday I downloaded lookout and updated Google street maps. anyone?? (HowTos)