Issue with step6

[bckaiwang]

when I run step6,it raise this issue:
File "qhull.pyx", line 2431, in scipy.spatial.qhull.ConvexHull.init
File "qhull.pyx", line 356, in scipy.spatial.qhull._Qhull.init
scipy.spatial.qhull.QhullError: QH7023 qhull option warning: unknown 'Q' qhull option 'Qn', skip to next space
QH6035 qhull option error: see previous warnings, use 'Qw' to override: 'qhull i QJn Pp QbB Qt' (last offset 9)

While executing: | qhull i QJn Pp QbB Qt
Options selected for Qhull 2019.1.r 2019/06/21:
run-id 165439650 incidence Pprecision-ignore QbBound-unit-box 0.5
Qtriangulate _maxoutside 0