我不断得到一个“线程”流中没有当前事件循环”

Question

我正试图根据我不久前找到的github回购协议重做一个项目。当我尝试运行作者的代码时，我得到“线程”流中没有当前事件循环”

我在网上浏览了一些stackoverflow问题，这些问题与我面临的问题相同，但它们的代码似乎与我的代码都不相似。他们都使用了Asyncio包，而我选择了线程包

以下是发生错误的python文件的代码：

import base64
import cv2
import time
from threading import Thread
import RPi.GPIO as GPIO
import collect
import visit
import os
#import save
#from pymongo import MongoClient

GPIO.setmode(GPIO.BCM)
GPIO.setwarnings(False)
GPIO.setup(17, GPIO.IN, pull_up_down=GPIO.PUD_UP)
GPIO.setup(27, GPIO.OUT)

class Stream(Thread):
    def __init__(self):
        self.flag = [False]
        self.capture_flag = [False]
        #self.ws = ws
        self.clients = []
        Thread.__init__(self, name=Stream.__name__)
        
    def run(self):
        
        self.camera = cv2.VideoCapture(0)
        
        prev_input = 1
        
        #mongo_db = MongoClient('localhost',27017)
        #db = mongo_db.smartbell.visitors       
        
        while True:
            # Read camera and get frame
            rval, frame = self.camera.read()
        
            if frame is None:
                self.camera.release()
                self.camera = cv2.VideoCapture(0)
                continue
            
            # Send camera stream to web
            if self.flag[0]:
                rvel, jpeg = cv2.imencode('.jpg', frame)
                encode_string = base64.b64encode(jpeg)
                for client in self.clients:
                    client.write_message(encode_string)
            
            # A visitor pushes button
            but = GPIO.input(17)
            if(not prev_input and but):
                # It affects dlib speed. If frame size is small, dlib would be faster than normal size frame
                small_frame = cv2.resize(frame, (0, 0), fx=0.25, fy=0.25)
                visit.visit(small_frame)
                for client in self.clients:
                    client.write_message("log")
            prev_input = but
            time.sleep(0.05)
            
            # Click makephotos on web browser
            if self.capture_flag[0] == True:

                enough_image = collect.make_photo(frame)

                if enough_image == "success":
                    print("Success to register")
                else:
                    print("Fail to register")
                for client in self.clients:
                    client.write_message(enough_image)

                self.capture_flag[0] = False
    
        self.camera.release()
    
    def change_capture_flag(self):
        self.capture_flag[0] = True

    def change_socket_flag(self):
        self.flag[0] = not self.flag[0]
    
    def add_client(self, newclient):
        self.clients.append(newclient)
        
    def remove_client(self, client):
        self.clients.remove(client)

错误：

Exception in thread Stream:
Traceback (most recent call last):
  File "/usr/lib/python3.7/threading.py", line 917, in _bootstrap_inner
    self.run()
  File "/home/pi/security-recognizer/python/videostream.py", line 55, in run
    client.write_message(encode_string)
  File "/home/pi/.virtualenvs/pfe/lib/python3.7/site-packages/tornado/websocket.py", line 340, in write_message
    return self.ws_connection.write_message(message, binary=binary)
  File "/home/pi/.virtualenvs/pfe/lib/python3.7/site-packages/tornado/websocket.py", line 1096, in write_message
    fut = self._write_frame(True, opcode, message, flags=flags)
  File "/home/pi/.virtualenvs/pfe/lib/python3.7/site-packages/tornado/websocket.py", line 1073, in _write_frame
    return self.stream.write(frame)
  File "/home/pi/.virtualenvs/pfe/lib/python3.7/site-packages/tornado/iostream.py", line 540, in write
    future = Future()  # type: Future[None]
  File "/usr/lib/python3.7/asyncio/events.py", line 644, in get_event_loop
    % threading.current_thread().name)
RuntimeError: There is no current event loop in thread 'Stream'.