Hello!
My first post here…
I´m trying to etch qrcodes in anodized aluminun and some smartphones doesn´t read them.
Looking around I saw that it´s better to have a darker foreground.
So I followed this example:
https://forum.lightburnsoftware.com/t/how-do-i-invert-negate-a-vector-engraving/594
But Lightburn showed this warning:
What is the correct way to output qrcode negative?
Thanks.
Eduardo
What 1 shape wasn’t closed?
If I make a QR in LB and then draw a square around it on the same layer it inverts just fine.
This notification is identifying an Open Shape set to Fill, so this is a different issue that will need to be addressed. What is shown if you select ‘Show me’ button? 
As for inverting the QR Code output. I simply selected the QR Code, then add an outward Offset of 0.5mm to it on the same fill layer.
One of the little squares the QR generator spit out isn’t closed? That’s interesting. Sounds like a question for Oz & co.
Can you close it and carry on?
yes, but I am afraid that the scanners are using some error correction to decode de qrcode.
when a use the offset the my qrcode isn´t inside a square like yours:
Turn the Offset from both inside and outside to only outside and a small amount. You should get one outline produced. You can practice with a simple square to see what I am showing. I have the resulting Offset shapes set to red to see easier.
Or, you can simply add a square as @Hank suggests as well. 
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