java.lang.RuntimeException: Unable to start activity ComponentInfo{com.entitcs.office_attendance/com.entitcs.office_attendance.activities.LeaveRequest}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.view.View.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:4164)
	at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:4322)
	at android.app.ActivityThread.handleRelaunchActivityInner(ActivityThread.java:6493)
	at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:6377)
	at android.app.servertransaction.ActivityRelaunchItem.execute(ActivityRelaunchItem.java:76)
	at android.app.servertransaction.ActivityTransactionItem.execute(ActivityTransactionItem.java:45)
	at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:139)
	at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:96)
	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2685)
	at android.os.Handler.dispatchMessage(Handler.java:106)
	at android.os.Looper.loopOnce(Looper.java:230)
	at android.os.Looper.loop(Looper.java:319)
	at android.app.ActivityThread.main(ActivityThread.java:8893)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:608)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1103)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.view.View.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
	at com.entitcs.office_attendance.activities.LeaveRequest.onCreate(Unknown Source:624)
	at android.app.Activity.performCreate(Activity.java:8935)
	at android.app.Activity.performCreate(Activity.java:8904)
	at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1456)
	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:4146)
	... 15 more