Error on execute

`Traceback (most recent call last):
  File "SimpleBot.py", line 107, in <module>
    main()
  File "SimpleBot.py", line 79, in main
    my_address.cancelOpenOrders(waves_btc)
  File "/home/fabiomattes/.pyenv/versions/3.7.3/lib/python3.7/site-packages/pywaves/address.py", line 876, in cancelOpenOrders
    status = order['status']
TypeError: string indices must be integers`