You have at least one error in your graph. Specifically, if you are using:
###########################################################
graph = {'q9': ['q10', 'q33'], 'q10': ['q11', 'q 28', 'q29', 'q30'],
'q11': ['q15'] , 'q16': ['q17', 'q19', 'q24'],' q18': ['q20'], 'q23':
['q34'], 'q24': ['q25', 'q26'], 'q27': ['q34'], 'q28': ['q30', 'q29'],
'q30': ['q34', 'q31', 'q12'], 'q32': ['q34'], 'q33': ['q15' , 'q30'],
'q35': ['q36', 'q37'], 'q37': ['q38', 'q39'], 'q39': ['q41', 'q40',
'q42'],'q42': ['end']}
###########################################################
to represent the graph structure you've presented, then 'q15' is missing.
Other nodes in your network may also be missing, so check your data again.
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