[RESOLVED] Report Viewer Error "Parameter Not Valid" When Print Preview in Portrait only!

Hi All,
I've been scratching my head here for a most of the day now,
I have a report viewer which will show a print preview of my report in Landscape, however when I print preview in Portrait I get an error..

"An error occurred during local report mode"
"Parameter is not Valid"

There is no more information, therefore I am kinda stumped to finding the source of the problem.

Has anyone else overcome this issue?
Does anyone know how I may be able to debug the error to find the source...

Thanks in advance..

BR
Phezo

Problem Resolved,
Simple Really, one of my chart controls width was wider than the A4 Sheet size, Looks like i need a break!... :)

BR
Phezo