`Traceback (most recent call last):


 "./app.py", line 5, in <module>

from schema import schema


 "/home/examples/flask_sqlalchemy/schema.py", line 28, in <module>

class Query(graphene.ObjectType):


 "/home/examples/flask_sqlalchemy/schema.py", line 32, in Query

Employee, sort=Employee.sort_argument())
AttributeError: type object 'Employee' has no attribute 'sort_argument'`

Traceback (most recent call last):


 "app.py", line 46, in <module>

main()


 "app.py", line 41, in main

behaviour.run(settings['market_pairs'], settings['output_mode'])


 "/app/behaviour.py", line 56, in run

self.__test_strategies(market_data, output_mode)


 "/app/behaviour.py", line 85, in __test_strategies

candle_period


 "/usr/local/lib/python3.6/site-packages/tenacity/__init__.py", line 214, in wrapped_f

return self.call(f, *args, **kw)


 "/usr/local/lib/python3.6/site-packages/tenacity/__init__.py", line 295, in call

start_time=start_time)


 "/usr/local/lib/python3.6/site-packages/tenacity/__init__.py", line 252, in iter

return fut.result()


 "/usr/local/lib/python3.6/concurrent/futures/_base.py", line 425, in result

return self.__get_result()


 "/usr/local/lib/python3.6/concurrent/futures/_base.py", line 384, in __get_result

raise self._exception


 "/usr/local/lib/python3.6/site-packages/tenacity/__init__.py", line 298, in call

result = fn(*args, **kwargs)


 "/app/exchange.py", line 59, in get_historical_data

if time_unit not in self.exchanges[exchange].timeframes:
AttributeError: 'cryptopia' object has no attribute 'timeframes'