java.lang.RuntimeException: startPreview failed
	at android.hardware.Camera.startPreview(Native Method)
	at n8.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.X(Unknown Source:37)
	at com.entitcs.office_attendance.camera.FaceTrackerActivity.E(Unknown Source:90)
	at com.entitcs.office_attendance.camera.FaceTrackerActivity$j.onClick(Unknown Source:19)
	at android.view.View.performClick(View.java:6935)
	at com.entitcs.office_attendance.java_classes.MovableFloatingActionButton.onTouch(Unknown Source:171)
	at android.view.View.dispatchTouchEvent(View.java:12628)
	at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3194)
	at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2857)
	at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3172)
	at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2857)
	at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3172)
	at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2857)
	at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3172)
	at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2857)
	at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3172)
	at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2857)
	at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3172)
	at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2857)
	at com.android.internal.policy.DecorView.superDispatchTouchEvent(DecorView.java:615)
	at com.android.internal.policy.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1879)
	at android.app.Activity.dispatchTouchEvent(Activity.java:3441)
	at h.m.dispatchTouchEvent(Unknown Source:2)
	at com.android.internal.policy.DecorView.dispatchTouchEvent(DecorView.java:577)
	at android.view.View.dispatchPointerEvent(View.java:12880)
	at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:5863)
	at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:5658)
	at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:5151)
	at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:5204)
	at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:5170)
	at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:5307)
	at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:5178)
	at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:5364)
	at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:5151)
	at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:5204)
	at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:5170)
	at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:5178)
	at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:5151)
	at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:7981)
	at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:7921)
	at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:7882)
	at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:8092)
	at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:198)
	at android.os.MessageQueue.nativePollOnce(Native Method)
	at android.os.MessageQueue.next(MessageQueue.java:325)
	at android.os.Looper.loop(Looper.java:142)
	at android.app.ActivityThread.main(ActivityThread.java:7000)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:441)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1408)