java.lang.RuntimeException: Unable to start activity ComponentInfo{com.entitcs.office_attendance/com.entitcs.office_attendance.CRM.InvoiceReport}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.LinearLayout.setVisibility(int)' on a null object reference
	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3748)
	at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3896)
	at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:101)
	at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
	at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2399)
	at android.os.Handler.dispatchMessage(Handler.java:111)
	at android.os.Looper.loopOnce(Looper.java:238)
	at android.os.Looper.loop(Looper.java:357)
	at android.app.ActivityThread.main(ActivityThread.java:8094)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:957)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.LinearLayout.setVisibility(int)' on a null object reference
	at com.entitcs.office_attendance.CRM.InvoiceReport.onCreate(InvoiceReport.java:177)
	at android.app.Activity.performCreate(Activity.java:8479)
	at android.app.Activity.performCreate(Activity.java:8458)
	at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1386)
	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3729)
	... 12 more