I'm not sure why I'm getting the error message:

The type or namespace name 'ReportFair' does not exist in the namespace 'ConcessionsApplication' (are you missing an assembly reference?)

Here is my code:
HTML Code:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;
using ConcessionsLibrary;
using CrystalDecisions.CrystalReports.Engine;
using CrystalDecisions.Shared;


namespace ConcessionsApplication
{
    public partial class frmReportFairs : Form
    {
        public frmReportFairs()
        {
            InitializeComponent();
        }

        private void frmReportFairs_Load(object sender, EventArgs e)
        {
            SqlConnection connection = ConcessionsDatabase.GetConnection();
            connection.Open();

            string selectStatement
                = "SELECT * "
                + "FROM Revenue";

            SqlDataAdapter myDataAdapter = new SqlDataAdapter(selectStatement, connection);
            DataSet fairDataSet = new DataSet();
            myDataAdapter.Fill(fairDataSet, "Fairs");
            connection.Close();

            ReportFairs report = new ReportFairs();
            report.SetDataSource(fairDataSet.Tables["Fair"].DefaultView);
            crystalReportViewer.ReportSource = report;
            crystalReportViewer.Show();
        }
    }
}
What am I doing wrong??