Coreldraw X7 Docker class no registered error.

Hi,

I have made docker in X7. I am importing a file on button click event but getting error.

my code is as below and attached error snapshot.

Public Class DockerUI

Private corelApp As Corel.Interop.VGCore.Application

Sub New(ByVal corelApp As Corel.Interop.VGCore.Application)
InitializeComponent()
Me.corelApp = corelApp
End Sub

Private Sub btnStartPro_Click(sender As Object, e As RoutedEventArgs) Handles btnStartPro.Click
Dim importfile As New ImportFilter
importfile = corelApp.ActiveLayer.ImportEx("D:\Logo.cdr", cdrFilter.cdrAutoSense, importfile)
End Sub


End Class