get Balance error

[thaisonhoa]

When I try to get my balance, I get this error:
Traceback (most recent call last):
File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/telegram/ext/dispatcher.py", line 279, in process_update
handler.handle_update(update, self)
File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/telegram/ext/commandhandler.py", line 171, in handle_update
return self.callback(dispatcher.bot, update, **optional_args)
File "telegram_kraken_bot.py", line 253, in _restrict_access
return func(bot, update)
File "telegram_kraken_bot.py", line 279, in balance_cmd
for currency_key, currency_value in res_balance["result"].items():
KeyError: 'result'