Can NOT initialize camera.

I want to take a picture when the PanelCamera is visible. But I can not initialize camera. When I press on the BtnCamera, program crashes. How can I sole this problem? My codes are given below;

Code:

  Sub BtnCamera_Click
    PanelMain.Visible = False
    PanelCamera.Visible = True
    btnTakePicture.Enabled = False
camera.Initialize(PanelCamera, "Camera")
End Sub

Sub Camera_Ready (Success As Boolean)
If Success Then
camera.StartPreview
        btnTakePicture.Enabled = True...  

Can NOT initialize camera.

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