执行以上代码，报错： 

File "minium_test.py", line 12, in <module>

    "test_port":9420

  File "D:\ProgramFiles\python\lib\site-packages\minium-0.0.2-py3.7.egg\minium\wechatdriver\minium.py", line 53, in __init__

    self.uri=uri+":"+test_port

TypeError: unsupported operand type(s) for +: 'dict' and 'str'。

怎么解决？