打开asp.net网页时发生错误,重启iis后又能用了,请问这是什么问题呢?请帮解决下,新手...

日志名称:          Application
来源:            ASP.NET 2.0.50727.0
日期:            2012/5/21 9:18:18
事件 ID:         1309
任务类别:          (3)
级别:            警告
关键字:           经典
用户:            暂缺
计算机:           WWW
描述:
Event code: 3005
Event message: 发生了未处理的异常。
Event time: 2012/5/21 9:18:18
Event time (UTC): 2012/5/21 1:18:18
Event ID: 4bb6ca83ec05423b9c03a2bb4c9535e6
Event sequence: 1728
Event occurrence: 328
Event detail code: 0

Application information:
    Application domain: /LM/W3SVC/1/ROOT-1-129819898326206986
    Trust level: Full
    Application Virtual Path: /
    Application Path: E:\wwwroot\
    Machine name: WWW

Process information:
    Process ID: 3920
    Process name: w3wp.exe
    Account name: IIS APPPOOL\DefaultAppPool32

Exception information:
    Exception type: IndexOutOfRangeException
    Exception message: nt_id

Request information:
    Request URL: http://www.1952tea.com/franchise.aspx
    Request path: /franchise.aspx
    User host address: 125.77.184.87
    User:
    Is authenticated: False
    Authentication Type:
    Thread account name: IIS APPPOOL\DefaultAppPool32

Thread information:
    Thread ID: 18
    Thread account name: IIS APPPOOL\DefaultAppPool32
    Is impersonating: False
    Stack trace:    在 hxy.DAL.NewTypeService.GetNewTypeByNt_id(Int32 nt_id)
   在 hxy.DAL.NewsnService.GetNewsnTable(DataTable table, DataRow row)
   在 hxy.DAL.NewsnService.GetAllByType(Int32 type, Int32 TopIndex)
   在 hxy.BLL.NewsnManager.GetAllByType(Int32 type, Int32 TopIndex)
   在 pages_control_index_JMDT.Page_Load(Object sender, EventArgs e)
   在 System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e)
   在 System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e)
   在 System.Web.UI.Control.OnLoad(EventArgs e)
   在 System.Web.UI.Control.LoadRecursive()
   在 System.Web.UI.Control.LoadRecursive()
   在 System.Web.UI.Control.LoadRecursive()
   在 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

Custom event details:

事件 Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="ASP.NET 2.0.50727.0" />
    <EventID Qualifiers="32768">1309</EventID>
    <Level>3</Level>
    <Task>3</Task>
    <Keywords>0x80000000000000</Keywords>
    <TimeCreated SystemTime="2012-05-21T01:18:18.000000000Z" />
    <EventRecordID>4275</EventRecordID>
    <Channel>Application</Channel>
    <Computer>WWW</Computer>
    <Security />
  </System>
  <EventData>
    <Data>3005</Data>
    <Data>发生了未处理的异常。</Data>
    <Data>2012/5/21 9:18:18</Data>
    <Data>2012/5/21 1:18:18</Data>
    <Data>4bb6ca83ec05423b9c03a2bb4c9535e6</Data>
    <Data>1728</Data>
    <Data>328</Data>
    <Data>0</Data>
    <Data>/LM/W3SVC/1/ROOT-1-129819898326206986</Data>
    <Data>Full</Data>
    <Data>/</Data>
    <Data>E:\wwwroot\</Data>
    <Data>WWW</Data>
    <Data>
    </Data>
    <Data>3920</Data>
    <Data>w3wp.exe</Data>
    <Data>IIS APPPOOL\DefaultAppPool32</Data>
    <Data>IndexOutOfRangeException</Data>
    <Data>nt_id</Data>
    <Data>http://www.1952tea.com/franchise.aspx</Data>
    <Data>/franchise.aspx</Data>
    <Data>125.77.184.87</Data>
    <Data>
    </Data>
    <Data>False</Data>
    <Data>
    </Data>
    <Data>IIS APPPOOL\DefaultAppPool32</Data>
    <Data>18</Data>
    <Data>IIS APPPOOL\DefaultAppPool32</Data>
    <Data>False</Data>
    <Data>   在 hxy.DAL.NewTypeService.GetNewTypeByNt_id(Int32 nt_id)
   在 hxy.DAL.NewsnService.GetNewsnTable(DataTable table, DataRow row)
   在 hxy.DAL.NewsnService.GetAllByType(Int32 type, Int32 TopIndex)
   在 hxy.BLL.NewsnManager.GetAllByType(Int32 type, Int32 TopIndex)
   在 pages_control_index_JMDT.Page_Load(Object sender, EventArgs e)
   在 System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e)
   在 System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e)
   在 System.Web.UI.Control.OnLoad(EventArgs e)
   在 System.Web.UI.Control.LoadRecursive()
   在 System.Web.UI.Control.LoadRecursive()
   在 System.Web.UI.Control.LoadRecursive()
   在 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
</Data>
  </EventData>
</Event>
求高手教下怎么解决.....

补充：.NET技术 ,  ASP.NET