Leadtools - OcrException - ocr Not included

I am using OCR from Leadtools

I have referenced the following DLLS:

Leadtools.dll
Leadtools.Barcode.oneD.dll
Leadtools.codecs.dll
Leadtools.codecs.fax.dll
Leadtools.codecs.png.dll
Leadtools.codecs.tif.dll
Leadtools.Forms.DocumentWriters.dll
Leadtools.forms.ocr.dll
Leadtools.forms.ocr.Advantage.dll

      

        
        
        
      

    

And the following code to convert Png file to Pdf

private void button1_Click(object sender, EventArgs e)
{

    try
    {

        string sourceFile = @"C:\Users\cf\Desktop\OcrTest\Images\Capture.PNG";
        string targetFile = Path.ChangeExtension(sourceFile, "pdf");

        using (IOcrEngine ocrEngine = OcrEngineManager.CreateEngine(OcrEngineType.Advantage, false))
        {
            ocrEngine.Startup(null, null, null, @"C:\LEADTOOLS 19\Bin\Common\OcrAdvantageRuntime");
            ocrEngine.AutoRecognizeManager.Run(sourceFile, targetFile, Leadtools.Forms.DocumentWriters.DocumentFormat.Pdf, null, null);
            Process.Start(targetFile);

        }
    }

    catch (OcrSupportLockedException ex)
    {
        Console.WriteLine("Support is locked. You need to unlock '{0}' in this engine to use this feature", ex.SupportType);
    }
    catch (OcrException ex)
    {
        Console.WriteLine("OCR Error\nCode: {0}\nMessage:{1}", ex.Code, ex.Message);
    }
    catch (RasterException ex)
    {
        Console.WriteLine("LEADTOOLS Error\nCode: {0}\nMessage:{1}", ex.Code, ex.Message);
    }
    catch (Exception ex)
    {
        Console.WriteLine("System Error\nMessage:{0}", ex.Message);
    }


}

      

        
        
        
      

    

The next line returns OcrException

Ocr Not Enabled

      

        
        
        
      

    

With code: -1760

I cannot understand why this is happening

Any help would be appreciated