AttributeError: 'AioClient' object has no attribute 'server_version_sem' My Network Problems? Why?

• etcd3-py version: 0.1.6
• Python version: 3.6.8
• Operating System: CentOS 8.2

Description

I just deploy an etcd cluster with TLS, only use AioClient to put key value into etcd，BUT aioclient create error as below!!

Describe what you were trying to get done.
Tell us what happened, what went wrong, and what you expected to happen.

What I Did

import asyncio
import etcd3


async def getFoo(client, key, value):
    await client.put(key, value)
    r = await client.range(key)
    print('key:', r.kvs[0].key, 'value:', r.kvs[0].value)


def main():
    key = "hello"
    value = "world"
    aio_client = etcd3.AioClient("192.168.11.109", 2379, protocol="https",
                                 cert=("cert/server.pem", "cert/server-key.pem,"),
                                 verify="cert/ca.pem", timeout=1000)
    loop = asyncio.get_event_loop()
    loop.run_until_complete(getFoo(aio_client, key, value))


if __name__ == "__main__":
    main()