python django工程上传一张照片调用python方法时报错，请问如何处理？
工程目录为：

代码为：
urls.py代码为：

# -*- coding:utf-8 -*-
"""face URL Configuration

The `urlpatterns` list routes URLs to views. For more information please see:
    https://docs.djangoproject.com/en/1.10/topics/http/urls/
Examples:
Function views
    1. Add an import:  from my_app import views
    2. Add a URL to urlpatterns:  url(r'^$', views.home, name='home')
Class-based views
    1. Add an import:  from other_app.views import Home
    2. Add a URL to urlpatterns:  url(r'^$', Home.as_view(), name='home')
Including another URLconf
    1. Import the include() function: from django.conf.urls import url, include
    2. Add a URL to urlpatterns:  url(r'^blog/', include('blog.urls'))
"""
from django.conf.urls import url
from django.contrib import admin
from jango import views

urlpatterns = [#路由
    url(r'^admin/', admin.site.urls),
    url(r'^$',views.index)
]

html代码为：

    
        
        
        
        

        

    












    上传照片
    
    





    

        
        

    

    

        
人脸识别扫描结果：
        


        
    

html代码对应的页面效果：

views.py代码为：

# -*- coding:utf-8 -*-
from django.shortcuts import render
from django.http import HttpResponse
import time
import findface

def index(request):
    method = request.method
    if method =='POST':
        if request.POST.get('path'):
            # faceinfo = face_api.getPicInfo('http://img.sccnn.com/bimg/337/47838.jpg')
            # return HttpResponse(faceinfo)
            pass
        else:
            img = request.FILES.get('file')#获取用户上传的文件(图片)
            if not img:#img没有值
                return HttpResponse(u'上传失败')
            a = time.time()
            path = 'static/faceimg/%s.jpg' %a
            with open('jango/'+path,'wb') as fn:#w写字符串，wb写文件
                fn.write(img.read())
                print str(a)+".jpg"
                b = str(a)+".jpg"
            findface.find(b)
            return render(request,'face.html',context={'imgurl':path})
    else:
        return render(request,'face.html',context={'imgurl':'http://img.sccnn.com/bimg/337/47838.jpg'})#首页照片的默认值，如果不需要则第三个参数可以不写
        #return render(request,'face.html')#首页照片的默认值，如果不需要则第三个参数可以不写

findface.py代码为：

# -*- coding: UTF-8 -*-
import numpy as np
import time
import cv2
def find(img_pic):
    face_cascade = cv2.CascadeClassifier('haarcascade_frontalface_default.xml')
    face_cascade.load(r'E:\OpenCV 2.4.9\opencv\sources\data\haarcascades\haarcascade_frontalface_default.xml')#不加这一行报错
    eye_cascade = cv2.CascadeClassifier('haarcascade_eye.xml')
    eye_cascade.load(r'E:\OpenCV 2.4.9\opencv\sources\data\haarcascades\haarcascade_eye.xml')#不加这一行报错

    img = cv2.imread(img_pic)
    path = 'static/faceimg/%s.jpg' % img_pic
    with open('jango/' + path, 'wb') as fn:  # w写字符串，wb写文件
        fn.write(img.read())
    gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
    faces = face_cascade.detectMultiScale(gray, 1.3, 5)
    for (x,y,w,h) in faces:
        img = cv2.rectangle(img,(x,y),(x+w,y+h),(255,0,0),2)
        roi_gray = gray[y:y+h, x:x+w]
        roi_color = img[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.imshow('img',img)
    cv2.waitKey(0)
    cv2.destroyAllWindows()

在地址栏输入：http://localhost:8000
点击“上传照片”，想要传递一张照片guofu.jpg，并调用findface.py的find方法显示人的面部，并用方框将人的面部括起来，但是出现下图的错误，请问如何解决？