IIS error message referrs wrong line number

[Christina N]

When my asp.net application halts with an error, IIS displays the error
message normally, but the reference to a line number within the source code
file is totally wrong. This happens all the time. And in different projects
as well.

Can anyone help me with this?
Christina

p.s.: I use .Net Framework 1.1 and VS.Net 2003


example:
(the line number +344 should have been 1449!)
===========
[NullReferenceException: Object reference not set to an instance of an
object.]
solardb._Default.Prove_Drawpage() +344
solardb._Default.Produksjon_Detaljer_Proc() +570
solardb._Default.Page_Load(Object sender, EventArgs e) +549
System.Web.UI.Control.OnLoad(EventArgs e) +67
System.Web.UI.Control.LoadRecursive() +35
System.Web.UI.Page.ProcessRequestMain() +731