Assertion error while drawing graph with pydot

I just started using pydot to create a graph. I just created a single node, but while tring to display the graph using jupyter notebook I’m having an issue.
This is my code:

import pydot
import os
from IPython.display import Image, display
G= pydot.Dot(graph_type='digraph')
node = pydot.Node("S'->.SnS->.(L)/.a")
G.add_node(node)
im = Image(G.create_png())
display(im)

And the following my error

"dot" with args ['-Tpng', 'C:\Users\MAYANK~1\AppData\Local\Temp\tmptw6hrboj'] returned code: 1

stdout, stderr:
 b''
b"'C:\Users\Mayank' is not recognized as an internal or external command,rnoperable program or batch file.rn"

---------------------------------------------------------------------------
AssertionError                            Traceback (most recent call last)
<ipython-input-10-fb336e9303b4> in <module>
      5 node = pydot.Node("S'->.SnS->.(L)/.a")
      6 G.add_node(node)
----> 7 im = Image(G.create_png())
      8 display(im)

~anaconda3libsite-packagespydot.py in new_method(f, prog, encoding)
   1721                 """Refer to docstring of method `create`."""
   1722                 return self.create(
-> 1723                     format=f, prog=prog, encoding=encoding)
   1724             name = 'create_{fmt}'.format(fmt=frmt)
   1725             self.__setattr__(name, new_method)

~anaconda3libsite-packagespydot.py in create(self, prog, format, encoding)
   1943             print(message)
   1944 
-> 1945         assert process.returncode == 0, process.returncode
   1946 
   1947         return stdout_data

AssertionError: 1

Please help me clear this error !!