Fingerprint image is too small

An unhandled exception of type 'System.ApplicationException' occurred in SourceAFIS.dll Additional information: Fingerprint image is too small.

MyFingerprint fp = new MyFingerprint();
       fp.Filename = filename;
       // Load image from the file
       //Console.WriteLine(" Image size = {0} x {1} (width x height)", fp.Image.GetLength(1), fp.Image.GetLength(0));
       Console.WriteLine(" Loading image from {0}...", filename);
       BitmapImage image = new BitmapImage(new Uri(filename, UriKind.RelativeOrAbsolute));
       //Console.WriteLine(" Image size = {0} x {1} (width x height)", fp.Image.GetLength(1), fp.Image.GetLength(0));
       fp.AsBitmapSource = image;
       // Above update of fp.AsBitmapSource initialized also raw image in fp.Image
       // Check raw image dimensions, Y axis is first, X axis is second
       Console.WriteLine(" Image size = {0} x {1} (width x height)", fp.Image.GetLength(1), fp.Image.GetLength(0));

       // Initialize empty person object and set its properties
       MyPerson person = new MyPerson();
       person.Name = name;
       // Add fingerprint to the person
       person.Fingerprints.Add(fp);

       // Execute extraction in order to initialize fp.Template
       Console.WriteLine(" Extracting template...");
       Afis.Extract(person);
       // Check template size
       Console.WriteLine(" Template size = {0} bytes", fp.Template.Length);

       return person;
   }

   static void Main(string[] args)
   {
       // Initialize SourceAFIS
       Afis = new AfisEngine();
       // Enroll some people
       List<MyPerson> database = new List<MyPerson>();
       database.Add(Enroll("http://localhost:6060/PhpProject2/img/img2.jpg", "Second"));
    }