cv2.error: OpenCV(3.4.3) C:\projects\opencv-python\opencv\modules\core\src\matrix.cpp:235: error: (-215:Assertion failed) s >= 0 in function 'cv::setSize'

[BlackDarkZeroXX98]

Necesito ayuda con este error, al momento de cambiar de persona me marca este error no se cual sera el problema (soy muy nuevo en esto tengo)

import numpy as np
import cv2
import pickle

Face = cv2.CascadeClassifier("haarcascade_frontalface_alt2.xml ")
eye = cv2.CascadeClassifier('cascades/data/haarcascade_eye.xml')
smile = cv2.CascadeClassifier('cascades/data/haarcascade_smile.xml')

recognizer = cv2.face.LBPHFaceRecognizer_create()
recognizer.read("trainner.yml")

labelids={"person_name", 1}

with open("labels.pickle","rb")as f:
og_labelids=pickle.load(f)
labelids={v:k for k,v in og_labelids.items()}

capt = cv2.VideoCapture(0)

while(True):
ret, frame = capt.read()
gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
faces = Face.detectMultiScale(gray, scaleFactor=1.5, minNeighbors=5)
for (x, y, w, h) in faces:
#print(x, y, w, h)
gray = gray[y:y+h, x:x+w]
color = frame[y:y+h, x:x+w]
#recordar
id_, conf = recognizer.predict(gray)
if (conf>=4 and conf<=85):
#print(id_)
#print(labelids[id_])
font = cv2.FONT_HERSHEY_SIMPLEX
name= labelids[id_]
color =(255,255,255)
stroke = 2
cv2.putText(frame, name, (x,y), font, 1, color, stroke, cv2.LINE_AA)

    img_item = "My-image.png"
    cv2.imwrite(img_item, color)

    color =  (255, 0, 0) #BGR 0-255
    stroke = 2
    end_cord_y = y+h
    end_cord_x  = x+w
    cv2.rectangle(frame, (x,y),(end_cord_x, end_cord_y), color, stroke)


cv2.imshow('frame', frame)
if(cv2.waitKey(20) & 0xFF == ord('q')):
    break

capt.release()
cv2.destroyAllWindows()