EDIT: Found the solution. Mesh was doublesided and had collisions, fixing this solved the issue.

Hey all,

so I'm trying to export a vertex animation of a simulation I did. This vertex animation will then be used in Unreal for a project I'm working on. My issue here is that when I try to export a mesh I get an error as seen on the pictures.
Also I get 2 different interfaces when creating the VAT node from the shelf tool and when creating it from the tab selection.
(VAT from TAB selection is slower because it cooks all the frames)

The error is about packed normals/ render position but I do not really understand what they mean by that.
I tried looking it up on google but unfortunately I didn't find any solution.
Do you guys happen to know why the export won't work?

I would like to share the Hip file but the cache I'm using is 6.7GB so it's too Heavy to post.

Also for the sake of clarity I'll explain what each pictures need to show:
1) Error message from VAT node created from shelf tool
2) Error message from VAT node created from TAB selection
3) UI of the VAT node created from shelf tool
4) UI of the VAT node created from TAB selection
5) UV's

Thanks in advance,