IOError: [Errno 32] Broken pipe

[NXDD]

When I press "s", the console shows:

saving drawing to spiro-08Oct2018-133122.eps/png
Exception in Tkinter callback
Traceback (most recent call last):
File "C:\Python27\lib\lib-tk\Tkinter.py", line 1541, in call
return self.func(*args)
File "C:\Python27\lib\lib-tk\turtle.py", line 710, in eventfun
fun()
File "C:/pythonlearning/PythonPlayground/eg_2 kleidoscope/spiro_original.py", line 192, in saveDrawing
img.save(fileName + '.png', 'png')
File "C:\Python27\lib\site-packages\PIL\Image.py", line 1406, in save
self.load()
File "C:\Python27\lib\site-packages\PIL\EpsImagePlugin.py", line 283, in load
self.im = Ghostscript(self.tile, self.size, self.fp)
File "C:\Python27\lib\site-packages\PIL\EpsImagePlugin.py", line 72, in Ghostscript
gs.write(s)

I opened the folder, finding the picture was not be saved as png.