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Settings under apps, all, camera, clear data and then restart your phone
Hi jzas,
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If the above does not work, try booting the device in to Safemode, this will cut off any third party app from using the Camera.
let us know if this helps.
If neither @Phy or @Jake-SonyXperiaSupport suggestions work you could repair your phone with PCC
Bridge (for Mac)
Alternatives on How to backup Xperias
To get rid of this,just disable google now and it should be fine.