my code generate this error when i click button
** Activity (main) Create, isFirst = true **
** Activity (main) Resume **
** Activity (main) Pause, UserClosed = false **
** Service (httputils2service) Create **
** Service (httputils2service) Start **
** Activity (jadid) Create, isFirst = true **
** Activity (jadid) Resume **
java.lang.RuntimeException: java.lang.NullPointerException
at anywheresoftware.b4a.keywords.Common$11.run(Common.java:1181)
at anywheresoftware.b4a.keywords.Common$12.run(Common.java:1192)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5019)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at anywheresoftware.b4a.keywords.Common.StartActivity(Common.java:853)
at anywheresoftware.b4a.keywords.Common$11.run(Common.java:1147)
... 10 more
	
	
	
	
	
	
	
		
			
			
			
			
			
		
	
	
	
		
	
	
		
	
			
			** Activity (main) Create, isFirst = true **
** Activity (main) Resume **
** Activity (main) Pause, UserClosed = false **
** Service (httputils2service) Create **
** Service (httputils2service) Start **
** Activity (jadid) Create, isFirst = true **
** Activity (jadid) Resume **
java.lang.RuntimeException: java.lang.NullPointerException
at anywheresoftware.b4a.keywords.Common$11.run(Common.java:1181)
at anywheresoftware.b4a.keywords.Common$12.run(Common.java:1192)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5019)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at anywheresoftware.b4a.keywords.Common.StartActivity(Common.java:853)
at anywheresoftware.b4a.keywords.Common$11.run(Common.java:1147)
... 10 more
			
				my code is here:
			
		
		
		#Region  Project Attributes
    #ApplicationLabel: vvvvv
    #VersionCode: 1
    #VersionName:
    'SupportedOrientations possible values: unspecified, landscape or portrait.
    #SupportedOrientations: unspecified
    #CanInstallToExternalStorage: False
#End Region
#Region  Activity Attributes
    #FullScreen: False
    #IncludeTitle: false
#End Region
Sub Process_Globals
    'These global variables will be declared once when the application starts.
    'These variables can be accessed from all modules.
    Private xui As XUI
    Dim htsabt As HttpJob
End Sub
Sub Globals
    'These global variables will be redeclared each time the activity is created.
    'Private Hsv1 As HorizontalScrollView
    'Dim jo As JavaObject
    'Dim anim As Animation
    
    Private lblsabt As Label
    Private Panel1 As Panel
    Private pnlsaye As Panel
    Private txtesm As EditText
    Private txttel As EditText
End Sub
Sub Activity_Create(FirstTime As Boolean)
    Activity.LoadLayout("sabtnam")
    htsabt.Initialize("sabt",Me)
    
End Sub
public Sub jobdone(job As HttpJob)
    If job.Success=True Then
    Else
        
        Log("Error: " & job.ErrorMessage)
        ToastMessageShow("خطا در برقرای اتصال",False)
    End If
End Sub
Private Sub lblsabt_Click
    Dim send As String
    send = "esm="&txtesm.Text&"&tel="&txttel.Text
    htsabt.PostString("http://shabhayeroshan.ir/sabtuser.php",send)
    lblsabt.Color=xui.Color_Cyan
    StartActivity(jadid)
    
    
End Sub 
				 
 
		 
 
		 
 
		