Proximity Sensor - Calibration Failed!

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2016-01-11 12:15

I'm a new owner of a Pro 5. My current version of Flyme OS is 4.5.4.2A.
When I answer to an incoming call or when I make a call the screen gets black. I thought that something goes wrong with the proximity sensor, so I tried to calibrate the proximity sensor. Unfornately, when I try to make the calibration there is the error "Calibration failed. Please try again!".
Can anyone inform how I can resolve this problem?
Thank you in advance.