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$OnClickListener)' on a null object reference
	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:4169)
	at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:4325)
	at android.app.ActivityThread.handleRelaunchActivityInner(ActivityThread.java:6484)
	at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:6341)
	at android.app.servertransaction.ActivityRelaunchItem.execute(ActivityRelaunchItem.java:71)
	at android.app.servertransaction.ActivityTransactionItem.execute(ActivityTransactionItem.java:45)
	at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
	at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2574)
	at android.os.Handler.dispatchMessage(Handler.java:106)
	at android.os.Looper.loopOnce(Looper.java:226)
	at android.os.Looper.loop(Looper.java:313)
	at android.app.ActivityThread.main(ActivityThread.java:8762)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:604)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1067)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.view.View.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
	at com.entitcs.office_attendance.activities.LeaveRequest.onCreate(Unknown Source:624)
	at android.app.Activity.performCreate(Activity.java:8591)
	at android.app.Activity.performCreate(Activity.java:8570)
	at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1384)
	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:4150)
	... 15 more