Polygon Track (0.00254mm or 0.1mil) which I can't delete!

[Kentxu]

Hello to all PCB designers!

I'm getting a Polygon Track on the bottom layer, which I think is an artifact from the board outline, and I can't delete it.
It is 0.00254mm wide, so shows up as a Width Constraint error:



Also, it is causing a gap in the polygon pour on the bottom layer because it is not on a net:


Has anyone experienced this, and any ideas on how to select and delete it?

Thanks, Ken

Using: AD15.0

[robertferanec]

If it is an artifact from board outline, you may need to go into outline mode: View -> Board Planning Mode. Maybe then it will be possible to delete it?