Report from Dataset won't display on Production Machine

I have a report that was developed from a dataset. It displays perfectly on my development machine, but produces a 'Database Login Error' , Error: Object reference not set to an instance of an object. when I try to access it from my production server.
I am using Crystal Reports 11.5
My development machine is running MS Windows XP
My Production server is running MS Windows Server 2003
All of my other reports run fine.
Thanks!

Hello Chuck and David. Just an FYI. I created a blog on what in my experience is the best way to troubleshoot issues with datasets. The blog is here;
/people/ludek.uher/blog/2009/03/02/troubleshooting-issues-with-vs-net-datasets-and-crystal-reports
Maybe it will help in the future.
Have a great weekend,
Ludek

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