Error edge cuts, render 3D

[mofetkiller]

Hello,
I have the following Problem:
After I edit some cuts in the layout for better isolation, I got the message “Cannot determine the board outline”, in the 3D-viewer.

I checked all cut lines, there are closed! Before this error everything was ok, and was able to render the 3D object.
The mysterious thing is, there is no exact message what is wrong, I mean something like “Unable to find segment with the endpoint of (1234 1234)”.

How can I solve this problem?

Kicad Version 5.1.0 -1, release build

Kind regards Mosfetkiller!

[Efcis]

Check the DRC in pcbnew. A click (or right-click - I can’t remember) on the error, if any, zooms on its location.

[Rene_Poschl]

Only 5.1 checks for edge cuts errors. If @mofetkiller uses any older version then they only have the option of looking at the pcb file using a text editor.

[eelik]

There can also be an extra leftover dangling segment somewhere. If it’s on top of another segment it’s impossible to notice by eyesight.

[mofetkiller]

Big thank you to you.
The DRC finds the rest of an edge cut (a small point, invisible for the eyes).