xsl problem

This is a discussion on xsl problem within the Sharepoint forums in Microsoft Tools category; Hi all, I'm having some trouble with modifying my XSL. I'm using Sharepoint designer to generate the xsl, and in the design, everthing seames fine. But when the code want to use the xsl, It generates the following exception: Cannot find the script or external object that implements prefix 'http://schemas.microsoft.com/WebParts/v2/DataView/runtime'. When I use some simple xsl, it works fine. I guess, I'm missing some dll or something. We are using MOSS 2007 Environment......