AttributeError encountered in generating and saving a 3D animation

[OrbitalMechanic]

I'm running OrbitalPy on a Mac Pro (2019) under Mac OS X Big Sur using the Anaconda distribution Python 3.7. Version 3.3.3 of Matplotlib is used. I get the following messages when I attempt to generate a 3D plot with animation turned on and when attempting to sate the animation to a .mp4 file:

`================================================================================
December 27, 2020 at 03:28:11
~/Keplerain Orbit Trajectory Plots - OrbitalPy-v0.7.0(python3)/OrbitalPy_Hohmann.py

Exception in Tkinter callback
Traceback (most recent call last):
File "/Users/user/opt/anaconda3/lib/python3.7/tkinter/init.py", line 1705, in call
return self.func(*args)
File "/Users/user/opt/anaconda3/lib/python3.7/tkinter/init.py", line 749, in callit
func(*args)
File "/Users/user/opt/anaconda3/lib/python3.7/site-packages/matplotlib/backends/_backend_tk.py", line 253, in idle_draw
self.draw()
File "/Users/user/opt/anaconda3/lib/python3.7/site-packages/matplotlib/backends/backend_tkagg.py", line 9, in draw
super(FigureCanvasTkAgg, self).draw()
File "/Users/user/opt/anaconda3/lib/python3.7/site-packages/matplotlib/backends/backend_agg.py", line 407, in draw
self.figure.draw(self.renderer)
File "/Users/user/opt/anaconda3/lib/python3.7/site-packages/matplotlib/artist.py", line 41, in draw_wrapper
return draw(artist, renderer, *args, **kwargs)
File "/Users/user/opt/anaconda3/lib/python3.7/site-packages/matplotlib/figure.py", line 1870, in draw
self.canvas.draw_event(renderer)
File "/Users/user/opt/anaconda3/lib/python3.7/site-packages/matplotlib/backend_bases.py", line 1759, in draw_event
self.callbacks.process(s, event)
File "/Users/user/opt/anaconda3/lib/python3.7/site-packages/matplotlib/cbook/init.py", line 229, in process
self.exception_handler(exc)
File "/Users/user/opt/anaconda3/lib/python3.7/site-packages/matplotlib/cbook/init.py", line 81, in _exception_printer
raise exc
File "/Users/user/opt/anaconda3/lib/python3.7/site-packages/matplotlib/cbook/init.py", line 224, in process
func(*args, **kwargs)
File "/Users/user/opt/anaconda3/lib/python3.7/site-packages/matplotlib/animation.py", line 959, in _start
self._init_draw()
File "/Users/user/opt/anaconda3/lib/python3.7/site-packages/matplotlib/animation.py", line 1703, in _init_draw
self._draw_frame(next(self.new_frame_seq()))
File "/Users/user/opt/anaconda3/lib/python3.7/site-packages/matplotlib/animation.py", line 1726, in _draw_frame
self._drawn_artists = self._func(framedata, *self._args)
File "/Users/user/opt/anaconda3/lib/python3.7/site-packages/orbital/plotting.py", line 238, in animate
self.pos_dot.set_3d_properties([z])
File "/Users/user/opt/anaconda3/lib/python3.7/site-packages/mpl_toolkits/mplot3d/art3d.py", line 143, in set_3d_properties
zs = np.broadcast_to(zs, xs.shape)
AttributeError: 'list' object has no attribute 'shape'
`
The Python program is attached to this note.

Any suggestions?

Sam Dupree.

OrbitalPy_Hohmann.py.txt