Error Reading fixed length file

I am using the following code to read the schema of a fixed length file from an xml settings file. However when I try to compile I get the following error
The type or namespace name 'Field' could not be found (are you missing a using directive or an assembly reference?)      
Here is the code
private static List<Field> GetFields()
        {
            List<Field> fields = new List<Field>();
            XmlDocument map = new XmlDocument();
            string appPath = System.IO.Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().GetName().CodeBase);
            //Load the mapping file into the XmlDocument
            map.Load(appPath + "\\CMDCSImportCSV_Settings.xml");

            //Load the field nodes.
            XmlNodeList fieldNodes = map.SelectNodes("/FileMap/Field");

            //Loop through the nodes and create a field object
            // for each one.
            foreach (XmlNode fieldNode in fieldNodes)
            {
                Field field = new Field();

                //Set the field's name
                field.Name = fieldNode.Attributes["Name"].Value;

                //Set the field's length
                field.Length =
                     Convert.ToInt32(fieldNode.Attributes["Length"].Value);

                //Set the field's starting position
                field.Start =
                      Convert.ToInt32(fieldNode.Attributes["Start"].Value);

                //Add the field to the Field list.
                fields.Add(field);


            }

            //Return the fields – this is now our map of how the flat
            // file is laid out.
            return fields;
        }

Any ideas?
Thanks,
Aditya