Segments do not appear in 3D

Operating system: Winsows 10
Slicer version:4.8.1
Expected behavior: create 3D visualisation
Actual behavior: nothing happens, error “failed to convert segmentation to closed surface”

Dear Slicer community,

I created segmentaton labels, but when I toggle "show 3D", nothing happens, and I also receive the error "failed to convert segmentation to closed surface".

Where did I go wrong?I couldn`t find the answer on the tutorials or SlicerWiki.

As I am quite a novice to Slicer, xould you please explain in detail to me?

Thank you so much!

Kind regards,
slicer_Screenshot Verena

How did you create segments? Can you reproduce the problem using latest nightly version of Slicer?

Thank you for your quick response. I created the segments manually and will try the latest version.
THank you. Kind regards