RuntimeError discord bot

前提・実現したいこと

ここに質問の内容を詳しく書いてください。
pythonでdiscordのbotを作ろうとしてた時、ほかの人は実行できるコードがエラーを吐き続けています

発生している問題・エラーメッセージ

RuntimeError                              Traceback (most recent call last)
~\Anaconda3\envs\discordbot\lib\site-packages\discord\client.py in run(self, *args, **kwargs)
    630         try:
--> 631             loop.run_forever()
    632         except KeyboardInterrupt:

~\Anaconda3\envs\discordbot\lib\asyncio\base_events.py in run_forever(self)
    524         if self.is_running():
--> 525             raise RuntimeError('This event loop is already running')
    526         if events._get_running_loop() is not None:

RuntimeError: This event loop is already running

During handling of the above exception, another exception occurred:

RuntimeError                              Traceback (most recent call last)
~\Anaconda3\envs\discordbot\lib\site-packages\discord\client.py in _cleanup_loop(loop)
     91     try:
---> 92         _cancel_tasks(loop)
     93         if sys.version_info >= (3, 6):

~\Anaconda3\envs\discordbot\lib\site-packages\discord\client.py in _cancel_tasks(loop)
     76 
---> 77     loop.run_until_complete(asyncio.gather(*tasks, return_exceptions=True))
     78     log.info('All tasks finished cancelling.')

~\Anaconda3\envs\discordbot\lib\asyncio\base_events.py in run_until_complete(self, future)
    569         try:
--> 570             self.run_forever()
    571         except:

~\Anaconda3\envs\discordbot\lib\asyncio\base_events.py in run_forever(self)
    524         if self.is_running():
--> 525             raise RuntimeError('This event loop is already running')
    526         if events._get_running_loop() is not None:

RuntimeError: This event loop is already running

During handling of the above exception, another exception occurred:

RuntimeError                              Traceback (most recent call last)
<ipython-input-8-19ac8c304d6a> in <module>
     21 
     22 # Bot起動
---> 23 client.run('my_token')

~\Anaconda3\envs\discordbot\lib\site-packages\discord\client.py in run(self, *args, **kwargs)
    635             future.remove_done_callback(stop_loop_on_completion)
    636             log.info('Cleaning up tasks.')
--> 637             _cleanup_loop(loop)
    638 
    639         if not future.cancelled():

~\Anaconda3\envs\discordbot\lib\site-packages\discord\client.py in _cleanup_loop(loop)
     95     finally:
     96         log.info('Closing the event loop.')
---> 97         loop.close()
     98 
     99 class _ClientEventTask(asyncio.Task):

~\Anaconda3\envs\discordbot\lib\asyncio\selector_events.py in close(self)
     86     def close(self):
     87         if self.is_running():
---> 88             raise RuntimeError("Cannot close a running event loop")
     89         if self.is_closed():
     90             return

RuntimeError: Cannot close a running event loop

該当のソースコード

python
1import discord
2@client.event
3async def on_ready():
4    msg = "TEST Botです．よろしく"
5    await client.send_message(text_chat,msg)
6
7# こんにちはメッセージ
8@client.event
9async def on_message(message):
10    if message.content.startswith("こんにちは"):
11        if client.user != message.author:
12            msg = "こんにちは " + message.author.name + "さん！"
13            await client.send_message(message.channel, msg)
14
15# メンバのステータスが変更されたら
16@client.event
17async def on_member_update(before, after):
18    if before.status != after.status:
19        msg = after.display_name + " さんが " + str(after.status) + " になりました"
20        await client.send_message(text_chat,msg)
21
22# Bot起動
23client.run('my_token')