can't use ImageCapture

Illustrator.Document newDoc = appIll.Documents.Add(Illustrator.AiDocumentColorSpace.aiDocumentCMYKColor, iWidth, iHeight);
Illustrator.ImageCaptureOptions imageCaptureOptions = new Illustrator.ImageCaptureOptions();
imageCaptureOptions.AntiAliasing = true;
imageCaptureOptions.Matte = false;
imageCaptureOptions.Transparency = true;

newDoc.ImageCapture(@"C:\EPSFileName.eps", null, imageCaptureOptions);

throw exception