Shape not closed to GCode processer

I have a shape that Shapr3d can extrude but when I pass it to a gcode processor it is seeing the outer part of shape as not closed. It is WAM for a Wazer water jet. Is there any tool inside Shapr3d to validate a closed shape ?

I will add this, if I extrude the shape, then project that face onto a plane the shape is closed inside gcode processor.

Welcome to the forum!

Maybe you could upload your file?? Or screenshot?