Android Question NullPointerException on xui.CreatePanel

#Region  Service Attributes
    #StartAtBoot: False
    #ExcludeFromLibrary: True
#End Region

Sub Process_Globals
    'These global variables will be declared once when the application starts.
    'These variables can be accessed from all modules.
    Dim Interval As Int:                Interval=1 'om de 5 minuten
    Private xui As XUI
    Dim Teller
End Sub

Sub Service_Create
    'This is the program entry point.
    'This is a good place to load resources that are not specific to a single activity.
    

End Sub

Sub Service_Start (StartingIntent As Intent)
    Log("Gedaan")
    StartServiceAtExact(Me, DateTime.Now + Interval * DateTime.TicksPerMinute, True)
    TellerNotification
    Service.StopAutomaticForeground 'Call this when the background task completes (if there is one)
End Sub

Sub Service_TaskRemoved
    'This event will be raised when the user removes the app from the recent apps list.
End Sub

'Return true to allow the OS default exceptions handler to handle the uncaught exception.
Sub Application_Error (Error As Exception, StackTrace As String) As Boolean
    Return True
End Sub

Sub Service_Destroy

End Sub

Sub TellerNotification
    Log("1")
    Dim p As Panel
    Log("1a")
    p = xui.CreatePanel("")
    Log("1b")
    p.SetLayoutAnimated(0, 0, 0, 24dip, 24dip)
    Log("2")
    Dim cvs As B4XCanvas
    cvs.Initialize(p)
    Log("3")
    Dim n As NB6
    Teller=Teller+1
    n.Initialize("default", Application.LabelName, "DEFAULT")
    Log("4")
    n.OnlyAlertOnce(True)
    Log("5")
    cvs.ClearRect(cvs.TargetRect)
    Log("6")
    cvs.DrawText(Teller, cvs.TargetRect.Width / 2, cvs.TargetRect.Height - 5dip, xui.CreateDefaultBoldFont(20), xui.Color_White, _
         "CENTER")
    Log("7")
    cvs.Invalidate
    Log("8")
    n.SmallIcon(cvs.CreateBitmap)
    Log("9")
    Dim Notification As Notification = n.Build("CountDownNotification", "...", "", "")
    Log("10")
    Notification.Notify(1)
    Log("11")
    cvs.Release
    Log("12")
End Sub

Gedaan
1
1a
trigger_tellernotification (java line: 195)
java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Object java.lang.ref.Reference.get()' on a null object reference
 at anywheresoftware.b4a.objects.B4XViewWrapper$XUI.CreatePanel(B4XViewWrapper.java:704)
 at b4a.example.trigger._tellernotification(trigger.java:195)
 at b4a.example.trigger._service_start(trigger.java:171)
 at java.lang.reflect.Method.invoke(Native Method)
 at anywheresoftware.b4a.BA.raiseEvent2(BA.java:191)
 at anywheresoftware.b4a.BA.raiseEvent(BA.java:171)
 at b4a.example.trigger.handleStart(trigger.java:100)
 at b4a.example.trigger.access$000(trigger.java:8)
 at b4a.example.trigger$2.run(trigger.java:80)
 at android.os.Handler.handleCallback(Handler.java:808)
 at android.os.Handler.dispatchMessage(Handler.java:101)
 at android.os.Looper.loop(Looper.java:166)
 at android.app.ActivityThread.main(ActivityThread.java:7425)
 at java.lang.reflect.Method.invoke(Native Method)
 at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:245)
 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:921)