TypeError: Image data can not convert to float

[andyrenshengjun]

I run below example code:

from ipymol import viewer as pymol
pymol.start()   # Start PyMOL RPC server
pymol.do('fetch 3uex, struct, async=0;')
pymol.do('remove solvent; ')

# smoothing parameters
pymol.do('alter all, b=10; alter all, q=1; set gaussian_resolution, 7.6;')
pymol.do('map_new map, gaussian, 1, n. C+O+N+CA, 5; isosurface surf, map, 1.5;')

# color struct according to atom count
pymol.do('spectrum count, rainbow, struct')

# color the map based on the b-factors of the underlying protein
pymol.do('cmd.ramp_new("ramp", "struct", [0,10,10], "rainbow") ')
 
# set the surface color
pymol.do('cmd.set("surface_color", "ramp", "surf")')
 
# hide the ramp and lines
pymol.do('disable ramp; hide lines;')

pymol.do('show sticks, org; show spheres, org;')

pymol.do('color magenta, org')
pymol.do('set_bond stick_radius, 0.13, org; set sphere_scale, 0.26, org;')
 
pymol.do('set_bond stick_radius, 0.13, org; set_bond stick_color, white, org; set sphere_scale, 0.26, org;')

pymol.do('set_view (\
    -0.877680123,    0.456324875,   -0.146428943,\
    0.149618521,   -0.029365506,   -0.988305628,\
    -0.455291569,   -0.889327347,   -0.042500813,\
    -0.000035629,    0.000030629,  -37.112102509,\
    -3.300258160,    6.586110592,   22.637466431,\
     8.231912613,   65.999290466,  -50.000000000 );')

pymol.do('ray;')

pymol.show()
pymol.do('png png0.png;')

Got below error message:
`---------------------------------------------------------------------------
TypeError Traceback (most recent call last)
in
37 pymol.do('ray;')
38
---> 39 pymol.show()
40 pymol.do('png png0.png;')

/usr/local/lib/python3.5/dist-packages/ipymol/core.py in show(self)
112 ax = fig.add_subplot(111)
113 ax.axis('off')
--> 114 ax.imshow(np.asarray(self.to_png()))
115 return fig
116

/usr/local/lib/python3.5/dist-packages/matplotlib/init.py in inner(ax, data, *args, **kwargs)
1803 "the Matplotlib list!)" % (label_namer, func.name),
1804 RuntimeWarning, stacklevel=2)
-> 1805 return func(ax, *args, **kwargs)
1806
1807 inner.doc = _add_data_doc(inner.doc,

/usr/local/lib/python3.5/dist-packages/matplotlib/axes/_axes.py in imshow(self, X, cmap, norm, aspect, interpolation, alpha, vmin, vmax, origin, extent, shape, filternorm, filterrad, imlim, resample, url, **kwargs)
5481 resample=resample, **kwargs)
5482
-> 5483 im.set_data(X)
5484 im.set_alpha(alpha)
5485 if im.get_clip_path() is None:

/usr/local/lib/python3.5/dist-packages/matplotlib/image.py in set_data(self, A)
640 if (self._A.dtype != np.uint8 and
641 not np.can_cast(self._A.dtype, float, "same_kind")):
--> 642 raise TypeError("Image data cannot be converted to float")
643
644 if not (self._A.ndim == 2

TypeError: Image data cannot be converted to float
`

And tried with previous fix as below, it still doesn't work
in ipymol core.py change to: from PIL import Image
ipymol: 0.2, install from the latest code
pymol: 1.8.2.0