‘GLib-GIO-Message: Using the 'memory' GSettings backend.’ throw when Face Detection in Ubuntu

Question

Each time when I run face detection in Python. It'll throw

GLib-GIO-Message: Using the 'memory' GSettings backend.

The below codes are my Python program haar_face_detect.py :

# -*- coding: utf-8 -*-

from numpy import *
import numpy as np
import cv2

face_cascade = cv2.CascadeClassifier('./haarcascade_frontalface_alt.xml')
img = cv2.imread('./G20_pictures/7.jpg')    
gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
faces = face_cascade.detectMultiScale(gray, 1.2, 1)

for (x,y,w,h) in faces:
        img2 = cv2.rectangle(img,(x,y),(x+w,y+h),(255,255,0),4)
        roi_gray = gray[y:y+h, x:x+w]
        roi_color = img[y:y+h, x:x+w]
cv2.imshow('img',img)
print(len(faces))

cv2.waitKey(0)
cv2.destroyAllWindows()
cv2.imwrite("save.jpg", img)

However, the below sentences will be appeared every time follow run haar_face_detect.py :

$ python haar_face_detect.py 
GLib-GIO-Message: Using the 'memory' GSettings backend.  Your settings will not be saved or shared with other applications.
init done 
opengl support available 
25

Then the program will keep running, can not stop, as if stuck the same. The process can only be terminated by forcibly closing. Could you please advise me how I can solve this problem? I need detailed instruction to run these commands.

Thanks.