java.lang.RuntimeException: Unable to start activity ComponentInfo{com.entitcs.office_attendance/com.entitcs.office_attendance.camera.FaceTrackerActivity}: android.util.AndroidRuntimeException: requestFeature() must be called before adding content at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2485) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2545) at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:4189) at android.app.ActivityThread.access$1200(ActivityThread.java:151) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1404) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:157) at android.app.ActivityThread.main(ActivityThread.java:5601) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:774) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:652) Caused by: android.util.AndroidRuntimeException: requestFeature() must be called before adding content at com.android.internal.policy.PhoneWindow.requestFeature(PhoneWindow.java:317) at android.app.Activity.requestWindowFeature(Activity.java:3755) at com.entitcs.office_attendance.camera.FaceTrackerActivity.onCreate(SourceFile) at android.app.Activity.performCreate(Activity.java:6355) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1108) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2438) ... 10 more