error: (-2) The node does not represent a user object (unknown type?) in function cvRead [closed]

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Hi all, My inviroment is windows 10, opencv 3.1, python 3.4 I'm trying to train my own Cascade using opencv_createsamples.exe and opencv_traincascade.exe. I've created a .vec file (it is loadable by opencv_createsamples) and trained a 11-stage cascade.xml file. When I try to load it in the python code, it run into an error saying "error: (-2) The node does not represent a user object (unknown type?) in function cvRead".

Here is my code:

import cv2
import numpy as np
import matplotlib.pyplot as plt
import time

face_cascade = cv2.CascadeClassifier('C:/Python34/opencvPracticePic/haarcascade_frontalface_default.xml')
eye_cascade = cv2.CascadeClassifier('C:/Python34/opencvPracticePic/haarcascade_eye.xml')

Pen_cascade = cv2.CascadeClassifier('C:/Python34/opencvPracticePic/Pencascade.xml')

cap = cv2.VideoCapture(0)


while (cap.isOpened()):
    ret, frame = cap.read()


    k= cv2.waitKey(16) & 0xFF == ord('q')
    if k==27:
        break

    gray = cv2.cvtColor(frame,cv2.COLOR_BGR2GRAY)
    faces = face_cascade.detectMultiScale(gray,1.3,5)
    Pen = Pen_cascade.detectMultiScale(gray, 20, 20)

    for (x,y,w,h) in Pen:
        cv2.rectangle(img,(x,y),(x+w,y+h),(255,255,0),2)
    for (x,y,w,h) in faces:
        cv2.rectangle(frame,(x,y),(x+w,y+h),(255,0,0),2)
        roi_gray= gray[y:y+h,x:x+w]
        roi_color = frame[y:y+h,x:x+w]
        eyes = eye_cascade.detectMultiScale(roi_gray)
        for(ex,ey,ew,eh) in eyes:
            cv2.rectangle(roi_color,(ex,ey),(ex+ew,ey+eh),(0,255,0),2)

    cv2.namedWindow('resized',cv2.WINDOW_NORMAL)
    cv2.resizeWindow('resized',600,400)
    cv2.imshow('resized',frame)

cap.release()
cv2.destroyAllWindows()

Here is the self-trained cascade xml file

Here is the .vec file created by opencv_createsamples

Much thanks for any response!