Page Error

An unexpected error has occurred on this page. The system administrators have been notified. Please feel free to contact us with the information surrounding this error.
The error occurred in: http://biotechconnections.org/default.aspx?IdTrang=Home&idCatolo=1-+Business+Banks
Error Message: There is already an open DataReader associated with this Command which must be closed first.

Stack Trace:
System.InvalidOperationException: There is already an open DataReader associated with this Command which must be closed first. at DataAccess.MenuLeft.cmd_MenuLeft.Get_List_MenuLeft() in C:\Inetpub\wwwroot\Solution_BIOTECH\DataAccess\MenuLeft\cmd_MenuLeft.cs:line 246 at Project_BIOTECH_C.Uc_Control_Template.uc_menu_left.getMenuLeft(String m_aaa) at Project_BIOTECH_C.Uc_Control_Template.uc_menu_left.Page_Load(Object sender, EventArgs e) at System.Web.UI.Control.OnLoad(EventArgs e) at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)