Nubia Z9 gives error on starting camera

I bought the nubia z9 mini last year November.

About a week ago this message appears when using the camera:

"camera error"
"Please make sure no other applications occupy the camera, or try to restart the phone. "

I tried restarting but the same error. As requested, I've run adb dumpsys:

> adb shell dumpsys media.camera

Camera module HAL API version: 0x100

Camera module API version: 0x100

Camera module name: QCamera Module

Camera module author: Qualcomm Innovation Center Inc

Number of camera devices: 2 Vendor tags left unimplemented.

Camera 0 static information:


Facing: BACK Orientation: 90


Device version: 0x100


Device is closed, no client instance

Camera 1 static information:


Facing: FRONT


Device version: 0x100

I put the New version V3.67 Android Version 5.1.1 [ROM], the error is same.
Can you help me?