C# Web Services Compilation Error

I created a webservice that works fine on my local machine. However when I upload it to my host I get this error:

Compiler Error Message: CS0246: The type or namespace name 'BL' could not be found (are you missing a using directive or an assembly reference?)

Here is the code

<%@ WebService Language="C#" Class="budget" %>

using System;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Web.SessionState;
using System.Data.SqlClient;
using System.Web.Services;
using System.Web.Services.Protocols;
using System.Web.Script.Services;
using System.Collections.Generic;
using System.Linq;
using System.Web.Script.Serialization;
using System.IO;
using System.Text.RegularExpressions;
using System.Text;
using System.Net.Mail;

/// <summary>
/// Summary description for data
/// </summary>
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]

[System.Web.Script.Services.ScriptService]
public class budget : System.Web.Services.WebService {

    public budget() {

        //Uncomment the following line if using designed components 
        //InitializeComponent(); 
    }

    protected BL BalAccess
    {
        get
        {
            BL BalAccess = new BL();
            return BalAccess;
        }
    }

    public string GetJson(DataTable dt)
    {
        JavaScriptSerializer serializer = new JavaScriptSerializer();
        serializer.MaxJsonLength = Int32.MaxValue;
        List<Dictionary<string, object>> rows = new List<Dictionary<string, object>>();
        Dictionary<string, object> row = null;

        foreach (DataRow dr in dt.Rows)
        {
            row = new Dictionary<string, object>();
            foreach (DataColumn col in dt.Columns)
            {
                row.Add(col.ColumnName, dr[col]);
            }
            rows.Add(row);
        }
        return serializer.Serialize(rows);
    }

    [WebMethod]
    public string jSelect(string TableName, string Fields, string Condition)
    {
        string sJSON = "";

        DataTable dt = new DataTable();
        dt = BalAccess.Select(TableName, Fields, Condition);

        int dtCount = dt.Rows.Count;

        if (dtCount > 0)
        {
            sJSON = GetJson(dt);
            sJSON = sJSON.Replace("null", "[]");

        }

        return sJSON;
    }
    
}

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