不知道为什么会报这个错,前面已经实例过了

public partial class AboutEloo : System.Web.UI.Page
    {
        hou ho = new hou();
        
        protected void Page_Load(object sender, EventArgs e)
        {
            
            if (!IsPostBack)
            {
                initDate();
            }

        }
        protected void initDate()
        {
            //得到数据
            LBabouteloo.Text = ho.AboutEloo();
        }
    }
}

public class hou
    {
        
        #region 得到关于易乐
        public string AboutEloo()
        {
            
            
            string sql = "select AboutEloo from Corporation";
            return DataAccess.RunSQLReturn_ExecuteScalar_String(sql);

        }
        #endregion
    }