"Incorrect outline" error in Splint Studio

[Marcin K]

Has anyone ran into this issue and has anyone diagnosed what causes this error to pop up during the outline stage in splint studio. This error is a nightmare. This is a digital impression. I went ahead and cleaned up as much issues with the scans in meshmixer and made sure there were no additional holes and or tunnels. I even tried to re-mesh the stl scan just in case there was something amiss. Still getting this stupid error.

I know i can get around this issue if i Design it in the older software but I'm a fixed technician and I'm hoping to find a solution to this so that the removable department can continue using the same software.