Python RuntimeError:线程'；中没有当前事件循环；螺纹-7'；。不和谐

我正在尝试使用Tkinter GUI，同时使用线程和异步IO运行discord机器人。我的代码如下：

def screen():
    global msg_entry, channel_entry


    main_window = tk.Tk()
    main_window.geometry('720x540+50+50')
    main_window.title('Control')
    main_window.configure(bg=col1) 
    main_window.resizable(0,0)

    msg_box = tk.Entry()




    msg_entry = tk.Entry(main_window, font = 'Helvetica 20',
                                 width = 10, bg = col4, fg = 'white')
    msg_entry.place(x=100, y=240)

    channel_entry = tk.Entry(main_window, font = 'Helvetica 20',
                                 width = 10, bg = col4, fg = 'white')
    channel_entry.place(x=350, y=240)

    submit = HoverButton(main_window, bd=0, highlightthickness=0,  font = 'Helvetica 25 bold', text = "Send",
                             width = 7, height = 1, bg = col4, fg = col2, justify = 'left'
                             ,command = lambda: asyncio.get_event_loop().run_until_complete(send()), activebackground = col5)
    submit.place(x= 220, y = 320)





    main_window.mainloop()

# 614001879831150605


async def send():
    ce = channel_entry.get()
    channel = client.get_channel(int(ce)) 
    await channel.send(msg_entry)

def func1():
    client.loop.create_task(update_meme())
    client.run(token)

if __name__ == '__main__':
    Thread(target = func1).start()
    Thread(target = screen).start()

我在运行代码时遇到以下错误：

RuntimeError:线程“thread-7”中没有当前事件循环。

我是线程和异步IO新手，因此非常感谢您的帮助