java.lang.NullPointerException: Attempt to invoke virtual method 'android.hardware.camera2.CaptureRequest$Builder android.hardware.camera2.CameraDevice.createCaptureRequest(int)' on a null object reference

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Attempt to invoke virtual method 'android.hardware.camera2.CaptureRequest$Builder android.hardware.camera2.CameraDevice.createCaptureRequest(int)' on a null object reference
java.lang.NullPointerException: Attempt to invoke virtual method 'android.hardware.camera2.CaptureRequest$Builder android.hardware.camera2.CameraDevice.createCaptureRequest(int)' on a null object reference
at com.google.android.cameraview.Camera2.captureStillPicture(Camera2.java:562)
at com.google.android.cameraview.Camera2.takePicture(Camera2.java:325)
at com.google.android.cameraview.CameraView.takePicture(CameraView.java:376)
at com.google.android.cameraview.demo.MainActivity$1.onClick(MainActivity.java:91)
at android.view.View.performClick(View.java:5280)
at android.view.View$PerformClick.run(View.java:21239)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:234)
at android.app.ActivityThread.main(ActivityThread.java:5526)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)

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