I'm producing an image for a large advertising sign and the graphic designer is asking for a 98" wide @ 200dpi jpg. I've adjusted my paper size to 98" wide and have imported my image from Sketchup. All looks completely normal. When I go to export to JPG or PNG, the image comes out completely blank and the file size is in the 1000kb range. What am I doing wrong? Any help would be greatly appreciated.

Thanks, Paul