ASP net c# check / fix error

Hello, this is a small website hosted on a ISP, with Cloudflare service and wrote on C# ASP.net, Plesk for Windows, and it was working fine for several months until today, we got an error, and we need to fix: Server Error in '/' Application. There is no row at position 0. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: [login to view URL]: There is no row at position 0. Source Error: Line 128: } Line 129: Line 130: DataRow ClientRow = [login to view URL]("Client","@Client",[login to view URL]); Line 131: if (ClientRow.B("HasContractualLimits")) Line 132: { Source File: d:\Inetpub\vhosts\[login to view URL]\[login to view URL]\App_Code\Controllers\[login to view URL] Line: 130 Stack Trace: [IndexOutOfRangeException: There is no row at position 0.] [login to view URL]`[login to view URL](Int32 userIndex) +2126463 System.Data.DataRowCollection.get_Item(Int32 index) +21 [login to view URL](String commandText, CommandType commandType, Object[] parameters) +90 [login to view URL](String storedProcedureName, Object[] parameters) +84 [login to view URL]() in d:\Inetpub\vhosts\[login to view URL]\[login to view URL]\App_Code\Controllers\[login to view URL] [TargetInvocationException: Exception has been thrown by the target of an invocation.] [login to view URL](Object target, Object[] arguments, Signature sig, Boolean constructor) +0 [login to view URL](Object obj, Object[] parameters, Object[] arguments) +87 [login to view URL](Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture) +101 [login to view URL](Object obj, Object[] parameters) +21 [login to view URL]`[login to view URL](Boolean runFunction) +2005 [login to view URL]`1..ctor(Boolean runFunction) in d:\Inetpub\vhosts\[login to view URL]\[login to view URL]\App_Code\[login to view URL] [login to view URL]`1..ctor() in d:\Inetpub\vhosts\[login to view URL]\[login to view URL]\App_Code\[login to view URL] Gdl.PortalDeNominaciones.GasNominationsEditor..ctor() +28 _GasNominationsEditor.Page_Load(Object sender, EventArgs e) in d:\Inetpub\vhosts\[login to view URL]\[login to view URL]\[login to view URL] [login to view URL](Object sender, EventArgs e) +51 [login to view URL](EventArgs e) +95 [login to view URL]() +59 [login to view URL](Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +678