Save is broken

[story645]

fig, axd = plt.subplot_mosaic([['imds']])
imd = ap.Image(axd['imds'], dsa)
axd['imds'].add_image(imd) #inside imshow
axd['imds'].set_aspect('equal') #inside imshow
fig.colorbar(imd, ax=axd['imds'])
fig.savefig("imd.png")

----------------------------------------------
AttributeErrorTraceback (most recent call last)
<ipython-input-39-efecf9540aa3> in <module>
      2 im = axd['im'].imshow(arr.T)
      3 fig.colorbar(im, ax=axd['im'])
----> 4 fig.savefig("im.png")
      5 
      6 fig, axd = plt.subplot_mosaic([['imds']])

~\Anaconda3\envs\mplrelease\lib\site-packages\matplotlib\figure.py in savefig(self, fname, transparent, **kwargs)
   2305                 patch.set_edgecolor('none')
   2306 
-> 2307         self.canvas.print_figure(fname, **kwargs)
   2308 
   2309         if transparent:

~\Anaconda3\envs\mplrelease\lib\site-packages\matplotlib\backend_bases.py in print_figure(self, filename, dpi, facecolor, edgecolor, orientation, format, bbox_inches, pad_inches, bbox_extra_artists, backend, **kwargs)
   2216                 self.figure.set_edgecolor(origedgecolor)
   2217                 self.figure.set_canvas(self)
-> 2218             return result
   2219 
   2220     @classmethod

~\Anaconda3\envs\mplrelease\lib\contextlib.py in __exit__(self, type, value, traceback)
    118         if type is None:
    119             try:
--> 120                 next(self.gen)
    121             except StopIteration:
    122                 return False

~\Anaconda3\envs\mplrelease\lib\site-packages\matplotlib\cbook\__init__.py in _setattr_cm(obj, **kwargs)
   2064         for attr, orig in origs.items():
   2065             if orig is sentinel:
-> 2066                 delattr(obj, attr)
   2067             else:
   2068                 setattr(obj, attr, orig)

AttributeError: __delete__