Error messages from the code: 
plot_potential_extrapolation_of_example_data 
========================================================== 
Traceback (most recent call last):

  File "C:\Users\Mohamed Nedal\Anaconda3\lib\site-packages\IPython\core\interactiveshell.py", line 3319, in run_code
    exec(code_obj, self.user_global_ns, self.user_ns)

  File "<ipython-input-5-ab04c847134a>", line 6, in <module>
    from solarbextrapolation.visualisation_functions import visualise

  File "C:\Users\Mohamed Nedal\Anaconda3\lib\site-packages\solarbextrapolation-0.1.dev163-py3.7.egg\solarbextrapolation\visualisation_functions.py", line 15, in <module>
    from mayavi import mlab

  File "C:\Users\Mohamed Nedal\Anaconda3\lib\site-packages\mayavi\mlab.py", line 15, in <module>
    from mayavi.core.common import process_ui_events

  File "C:\Users\Mohamed Nedal\Anaconda3\lib\site-packages\mayavi\core\common.py", line 16, in <module>
    from apptools.persistence.state_pickler import create_instance

  File "C:\Users\Mohamed Nedal\Anaconda3\lib\site-packages\apptools\persistence\state_pickler.py", line 1210
    
    ^
SyntaxError: invalid syntax 



Traceback (most recent call last):

  File "C:\Users\Mohamed Nedal\Anaconda3\lib\site-packages\IPython\core\interactiveshell.py", line 3319, in run_code
    exec(code_obj, self.user_global_ns, self.user_ns)

  File "<ipython-input-6-5fe8942fc5cc>", line 3, in <module>
    from mayavi import mlab

  File "C:\Users\Mohamed Nedal\Anaconda3\lib\site-packages\mayavi\mlab.py", line 15, in <module>
    from mayavi.core.common import process_ui_events

  File "C:\Users\Mohamed Nedal\Anaconda3\lib\site-packages\mayavi\core\common.py", line 16, in <module>
    from apptools.persistence.state_pickler import create_instance

  File "C:\Users\Mohamed Nedal\Anaconda3\lib\site-packages\apptools\persistence\state_pickler.py", line 1210
    
    ^
SyntaxError: invalid syntax 



---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-11-2758ef2abc0d> in <module>
      1 # Use potential extrapolator to generate field
----> 2 aPotExt = PotentialExtrapolator(map_boundary, zshape=arr_grid_shape[2], zrange=zrange)
      3 aMap3D  = aPotExt.extrapolate(enable_numba=True)
      4 
      5 # The Extrapolations run time is stored in the meta

~\Anaconda3\lib\site-packages\solarbextrapolation-0.1.dev163-py3.7.egg\solarbextrapolation\extrapolators\potential_field_extrapolator.py in __init__(self, map_magnetogram, **kwargs)
     38     """
     39     def __init__(self, map_magnetogram, **kwargs):
---> 40         super(PotentialExtrapolator, self).__init__(map_magnetogram, **kwargs)
     41         self.meta['extrapolator_routine'] = 'Potential Field Extrapolator'
     42 

~\Anaconda3\lib\site-packages\solarbextrapolation-0.1.dev163-py3.7.egg\solarbextrapolation\extrapolators\base.py in __init__(self, map_magnetogram, **kwargs)
     83 
     84         # Crop the boundary data if required.
---> 85         self.xrange = kwargs.get('xrange', self.map_boundary_data.xrange)
     86         self.yrange = kwargs.get('yrange', self.map_boundary_data.yrange)
     87         self.map_boundary_data = self.map_boundary_data.submap(self.xrange, self.yrange)

AttributeError: 'GenericMap' object has no attribute 'xrange' 



---------------------------------------------------------------------------
NameError                                 Traceback (most recent call last)
<ipython-input-12-c7e52e111cca> in <module>
      1 # Visualise the 3D vector field
----> 2 fig = visualise(aMap3D,
      3                 boundary=map_boundary,
      4                 volume_units=[1.0*u.arcsec, 1.0*u.arcsec, 1.0*u.Mm],
      5                 show_boundary_axes=False,

NameError: name 'visualise' is not defined