Maybe I don’t understand.
I made another example and I have the same error.
region nanowire prism 0.0 25.0 -1.267 25.0 -2.6137 2439.237 -8.772 0 0
group nw region nanowire
group vide subtract all nw
delete_atoms group vide
That means I created another nanofil with the dimensions for 8x8x80 and I tried to cut the others 20 % atoms.
I can’t really find the mistake.