Error using Server.Transer

[K Viltersten]

I'm executing this code:

Server.Transfer("~/somePath/somePage.aspx");

The error that occurs is as follows.

"Error executing child request
for ~/somePath/somePage.aspx."

According to MS it's caused by calling an ASP
page from ASP.NET code and use of Redirect
method is recommended instead.

http://support.microsoft.com/kb/320439

The problem is that in my case it's ASP.NET
all the way so i can't really see the issue.
What might be causing it and how to kill it?