Error when run report in workspace.

After running some instances of my process, there are some instances with status "Error" and "Complete". When I ran report in workspace, it raised an Exception as the following:

System.Web.Services.Protocols.SoapException: Server was unable to process request --> System.IndexOutOfRangeException. There is no row at position 0. at System.Data.DataRowCollection.get_Item(Int32 index) at WorkSpaceService.FilterService.GetDatat(Int32 ReportID, Int32 TempID, String ParameterStr,String UserName, String SortOrder, String String SortDir, Int32 NumberItems, Int32 PageNo) -- End of inner exception stack trace --

What should I do now? Thanks in advance.