problem with reading .pkl file

[SriSatyaLokesh]

sc = nx.read_gpickle('Datasets/Synthetic Social Network.pkl')

plt.figure(figsize=(10,7))

nx.draw_networkx(sc,node_color='c',node_size=900,with_labels=True)

got this error
AttributeError Traceback (most recent call last)
in
3 plt.figure(figsize=(10,7))
4
----> 5 nx.draw_networkx(sc,node_color='c',node_size=900,with_labels=True)

~/.local/lib/python3.6/site-packages/networkx/drawing/nx_pylab.py in draw_networkx(G, pos, arrows, with_labels, **kwds)
273
274 if pos is None:
--> 275 pos = nx.drawing.spring_layout(G) # default to spring layout
276
277 node_collection = draw_networkx_nodes(G, pos, **kwds)

</home/satya/.local/lib/python3.6/site-packages/decorator.py:decorator-gen-782> in fruchterman_reingold_layout(G, k, pos, fixed, iterations, threshold, weight, scale, center, dim, seed)

~/.local/lib/python3.6/site-packages/networkx/utils/decorators.py in _random_state(func, *args, **kwargs)
403 new_args = list(args)
404 new_args[random_state_index] = random_state
--> 405 return func(*new_args, **kwargs)
406 return _random_state
407

~/.local/lib/python3.6/site-packages/networkx/drawing/layout.py in fruchterman_reingold_layout(G, k, pos, fixed, iterations, threshold, weight, scale, center, dim, seed)
441 pos_arr = None
442
--> 443 if len(G) == 0:
444 return {}
445 if len(G) == 1:

~/.local/lib/python3.6/site-packages/networkx/classes/graph.py in len(self)
430
431 """
--> 432 return len(self._node)
433
434 def getitem(self, n):

AttributeError: 'Graph' object has no attribute '_node'

##why?
and
##how to solve?