java.lang.RuntimeException: startPreview failed
	at android.hardware.Camera.startPreview(Native Method)
	at h9.a.d(Unknown Source:20)
	at com.entitcs.office_attendance.camera.CameraSourcePreview.f(Unknown Source:29)
	at com.entitcs.office_attendance.camera.CameraSourcePreview.d(Unknown Source:12)
	at com.entitcs.office_attendance.camera.CameraSourcePreview.e(Unknown Source:2)
	at com.entitcs.office_attendance.camera.FaceTrackerActivity.W(Unknown Source:37)
	at com.entitcs.office_attendance.camera.FaceTrackerActivity.D(Unknown Source:90)
	at com.entitcs.office_attendance.camera.FaceTrackerActivity$j.onClick(Unknown Source:19)
	at android.view.View.performClick(View.java:7799)
	at com.entitcs.office_attendance.java_classes.MovableFloatingActionButton.onTouch(Unknown Source:171)
	at android.view.View.dispatchTouchEvent(View.java:15836)
	at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3160)
	at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2828)
	at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3160)
	at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2828)
	at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3160)
	at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2828)
	at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3160)
	at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2828)
	at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3160)
	at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2828)
	at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3160)
	at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2828)
	at com.android.internal.policy.DecorView.superDispatchTouchEvent(DecorView.java:563)
	at com.android.internal.policy.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1908)
	at android.app.Activity.dispatchTouchEvent(Activity.java:4584)
	at h.j.dispatchTouchEvent(Unknown Source:2)
	at com.android.internal.policy.DecorView.dispatchTouchEvent(DecorView.java:521)
	at android.view.View.dispatchPointerEvent(View.java:16145)
	at com.xiaomi.mirror.MiuiMirrorImpl.isHandled(MiuiMirrorImpl.java:152)
	at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:7823)
	at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:7589)
	at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:6961)
	at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:7018)
	at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:6984)
	at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:7149)
	at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:6992)
	at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:7206)
	at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:6965)
	at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:7018)
	at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:6984)
	at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:6992)
	at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:6965)
	at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:10135)
	at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:10086)
	at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:10050)
	at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:10296)
	at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:307)
	at android.os.MessageQueue.nativePollOnce(Native Method)
	at android.os.MessageQueue.next(MessageQueue.java:341)
	at android.os.Looper.loopOnce(Looper.java:176)
	at android.os.Looper.loop(Looper.java:318)
	at android.app.ActivityThread.main(ActivityThread.java:8762)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:561)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1013)