You have to troubleshoot. Some things to try.
-Make it smaller. For example make a view with site, a view with building and a view with furniture. Then export each view and see if that works or where the issue is. (You can load multiple Datasmith files in Twinmotion.)
-Hide 2d elements (e.g. text, lines, grids)
-Hide several categories and then export. See if it starts to work if certain categories are hidden. Then you might start to pinpoint what the cause is.
-From the screenshot it looks you might have overlapping elements, correct those
Louis

Please mention Revit version, especially when uploading Revit files.