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Settings-apps-all-camera,clear data and cache,restart the phone.Are you using 3rd party camera apps?
Remove any of the 3rd party apps,force restart the phone(power button+vol up until the phone vibrates).See if that appears again.
How do I know if my xperia z1 is Model SO-01F or SOL23?
http://en.wikipedia.org/wiki/Sony_Xperia_Z1
I do not think your xperia is any of them,where are you from?