java.lang.NumberFormatException: For input string: ""
	at java.lang.Integer.parseInt(Integer.java:627)
	at java.lang.Integer.parseInt(Integer.java:650)
	at com.entitcs.office_attendance.activities.ShowSubscriptionPage$2.onClick(ShowSubscriptionPage.java:215)
	at android.view.View.performClick(View.java:7300)
	at android.view.View.performClickInternal(View.java:7277)
	at android.view.View.access$3600(View.java:822)
	at android.view.View$PerformClick.run(View.java:28027)
	at android.os.Handler.handleCallback(Handler.java:883)
	at android.os.Handler.dispatchMessage(Handler.java:100)
	at android.os.Looper.loop(Looper.java:224)
	at android.app.ActivityThread.main(ActivityThread.java:7574)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:539)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:950)