sharepoint自定义工作流启动时出现异常,跪求各位大神帮忙分析一上异常信息

sharepoint自定义工作流启动时出现错误,跪求各位大神帮忙分析一下错误信息
02/02/2012 17:38:10.83  w3wp.exe (0x1108)                        0x1DBC SharePoint Foundation          Workflow Infrastructure        98d4 Unexpected Microsoft.SharePoint.SPException ---> System.Runtime.InteropServices.COMException (0x80070001): <nativehr>0x80070001</nativehr><nativestack></nativestack>     at Microsoft.SharePoint.Library.SPRequestInternalClass.GetMetadataForUrl(String bstrUrl, Int32 METADATAFLAGS, Guid& pgListId, Int32& plItemId, Int32& plType, Object& pvarFileOrFolder)     at Microsoft.SharePoint.Library.SPRequest.GetMetadataForUrl(String bstrUrl, Int32 METADATAFLAGS, Guid& pgListId, Int32& plItemId, Int32& plType, Object& pvarFileOrFolder)     --- End of inner exception stack trace ---     at Microsoft.SharePoint.SPGlobal.HandleComException(COMException comEx)     at Microsoft.SharePoint.Library.SPRequest.GetMetadataForUrl(String bstrUrl, Int32 METADATAFLAGS, Guid& pgListId, Int32& plItemId, Int32& plType, Object& pvarFileOrFolder) at Microsoft.SharePoint.SPWeb.GetList(String strUrl)     at NNST.EIP.Workflow.RP.PurchaseException.PurchaseException.UpDate(Object sender, EventArgs e)     at System.Workflow.ComponentModel.Activity.RaiseEvent(DependencyProperty dependencyEvent, Object sender, EventArgs e)     at System.Workflow.Activities.CodeActivity.Execute(ActivityExecutionContext executionContext)     at System.Workflow.ComponentModel.ActivityExecutor`1.Execute(T activity, ActivityExecutionContext executionContext)     at System.Workflow.ComponentModel.ActivityExecutor`1.Execute(Activity activity, ActivityExecutionContext executionContext)     at System.Workflow.ComponentModel.ActivityExecutorOperation.Run(IWorkflowCoreRuntime workflowCoreRuntime)     at System.Workflow.Runtime.Scheduler.Run()
------解决方案--------------------
你用什么开发的?VS2010?还是moss自带的?