When adding CDD/.pdx file in canalyzer. my vba call to capl function not working

Code Visual Basic - [expand]
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Public WithEvents mCANalyzerApp As CANalyzer.Application
    Public WithEvents mCANalyzerMeasurement As CANalyzer.Measurement
    Public ExternFunc As CANalyzer.CAPLFunction
 
 Private Sub MeasurementInitiated()
    
        Try
     
 
            CANalyzerCAPL.Compile(Nothing)
            ExternFunc = CANalyzerCAPL.GetFunction("samplefun")'function is defined in capl
          
        Catch ex As Exception
 
        End Try
 
 
    End Sub
 
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
      
        Try
            mCANalyzerApp = New CANalyzer.Application
 
 
            mCANalyzerApp.Open("-path to .cfg", True, True)
        mCANalyzerMeasurement = mCANalyzerApp.Measurement
 
            AddHandler mCANalyzerMeasurement.OnInit, AddressOf MeasurementInitiated
 
 
 
   Catch ex As Exception
 
        End Try
 
 
    End Sub
 
 Private Sub start_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Start.Click
 
         mCANalyzerMeasurement.Start()
 
 
 
 
 
   Private Sub MsgSend_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MsgSend.Click
      
        Try
 
            TextBox1.Text = ExternFunc.Call()'call to capl function
      
 
 
 
        Catch ex As Exception
 
        End Try
 
 
 
    End Sub
 
 
 
 
 
**********************************CAPL code*********************************************
 
variables
{
 
}
 
 
void samplefun()
{
 
Write("Hello in capl");
 
}