AttributeError: 'Picamera2' object has no attribute '_preview'

[bartjan2008]

When running my python script that was perfectly running a week ago, it gives the error AttributeError: 'Picamera2' object has no attribute '_preview'

from flask import Flask, render_template, url_for, request, Response import numpy as np import cv2 import io import picamera2 import atexit import RPi.GPIO as GPIO

GPIO.setmode(GPIO.BOARD) GPIO.setup(22, GPIO.OUT)

global global_lightOn global_lightOn = False flippedhorizontal = 0

camera = picamera2.Picamera2() camera.configure( camera.create_preview_configuration( main={"format": "XRGB8888", "size": (3280, 2464)} ) ) camera.start() app = Flask(name)

def generate_frames(): while True: frame = camera.capture_array() ret, buffer = cv2.imencode(".jpg", frame) frame = buffer.tobytes() yield (b"--frame\r\n" b"Content-Type: image/jpeg\r\n\r\n" + frame + b"\r\n")

@app.route("/") @app.route("/home") def home(): return render_template("home.html")

@app.route("/up", methods=["POST", "GET"]) def up(): print("up") return render_template("home.html")

@app.route("/down", methods=["POST", "GET"]) def down(): print("down") return render_template("home.html")

@app.route("/home-focus", methods=["POST", "GET"]) def homefocus(): print("home-focus") return render_template("home.html")

@app.route("/left", methods=["POST", "GET"]) def left(): print("left") return render_template("home.html")

@app.route("/right", methods=["POST", "GET"]) def right(): print("right") return render_template("home.html")

@app.route("/forward", methods=["POST", "GET"]) def forward(): print("forward") return render_template("home.html")

@app.route("/back", methods=["POST", "GET"]) def back(): print("back") return render_template("home.html")

@app.route("/home-xy", methods=["POST", "GET"]) def homexy(): print("home-xy") return render_template("home.html")

@app.route("/light", methods=["POST", "GET"]) def light(): global global_lightOn if global_lightOn: print("light off") GPIO.output(22, GPIO.LOW) global_lightOn = False

else:
    print("light on")
    GPIO.output(22, GPIO.HIGH)
    global_lightOn = True
print("light")
return render_template("home.html")

@app.route("/flip-horizontal", methods=["POST", "GET"]) def fliphorizontal(): global flippedhorizontal flippedhorizontal = flippedhorizontal + 90 print("flip-horizontal") return render_template("home.html")

@app.route("/flip-vertical", methods=["POST", "GET"]) def flipvertical(): global flippedhorizontal flippedhorizontal = flippedhorizontal - 90 print("flip-vertical") return render_template("home.html")

@app.route("/stream") def stream(): return Response( generate_frames(), mimetype="multipart/x-mixed-replace; boundary=frame" )

if name == "main": app.run(host="0.0.0.0", threaded=True)

Expected behaviour I expected the Pi to just run

Console Output, Screenshots Traceback (most recent call last): File "/home/raspi/picamera2-WebUI-Lite/app.py", line 19, in picam2 = Picamera2() ^^^^^^^^^^^ File "/usr/lib/python3/dist-packages/picamera2/picamera2.py", line 242, in init camera_num = self.global_camera_info()[camera_num]['Num']

IndexError: list index out of range
Exception ignored in: <function Picamera2.__del__ at 0x7f6f6d6f20>
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/picamera2/picamera2.py", line 404, in __del__
    self.close()
  File "/usr/lib/python3/dist-packages/picamera2/picamera2.py", line 604, in close
    if self._preview:
       ^^^^^^^^^^^^^
AttributeError: 'Picamera2' object has no attribute '_preview'

**Hardware :**
Raspberry pi 4 8gb ram HQ camera

**Additional context**
I have already tried updating my Raspi OS and updating the picamera2 but no result