连接iOS一直提示"TypeError: string indices must be integers"

输入http://127.0.0.1:8200，之后一直提示"TypeError: string indices must be integers"

打印的报错信息：
[15:09:01][ERROR] Traceback (most recent call last):
File "app\plugins\devicepool\abstract\device.py", line 82, in run
File "app\plugins\devicepool\ios\device.py", line 81, in connect
File "airtest\core\api.py", line 69, in connect_device
dev = init_device(platform, uuid, **params)
File "airtest\core\api.py", line 37, in init_device
dev = cls(uuid, **kwargs)
File "C:\Users\user\Downloads\AirtestIDE-win-1.2.14\AirtestIDE\airtest\core\ios\ios.py", line 110, in __init__
self.instruct_helper = InstructHelper(info['uuid'])
TypeError: string indices must be integers