Python error TypeError: string indications must be integrers

Traceback (most recent call last):
  File "face.py", line 29, in <module>
    fr = face ["faceRectangle" ]
TypeError: string indications must be integrers

import requests
import matplotlib.pyplot asplt
from PIL import Image
from matplotlib import patches
from io import BytesIO

subscription_key="****************"
assert subscription_key

face_api_url='https://westcentralus.api.cognitive.microsoft.com/face/v1.0/detect'

image_url='https://how-old.net/Images/faces2/main007.jpg'

headers = {'Ocp-Apim-Subscription-Key': '********'}
param={
    'returnFaceId': 'true',
    'returnFaceLandmarks': 'false',
    'returnFaceAttributes': 'age, gender, headPose, smile, facialHair, classes, '+
    'emotion, hair, makeup, occlusions, accessories, blur, exposure, noise'
}
data={'url':image_url}
response=requests.post(face_api_url, params=params, heads=headers, json=data)
faces=response.json()

image=Image.open(BytesIO(requests.get(image_url).content))
plt.figure(figsize=(8,8))
ax=plt.imshow (image, alpha=0.6)
For face in faces:
    fr = face ["faceRectangle" ]
    fa=face["faceAttributes"]
    origin=(fr["left"], fr["top"])
    p=patches.Rectangle(
        origin, fr["width"], fr["height"], fill=False, linewidth=2, color='b')
    ax.axes.add_patch(p)
    plt.text(origin[0], origin[1], "%s, %d"% (fa["gender"].capitalize(), fa["age"]),
             fontsize=20, weight="bold",va="bottom")
_=plt.axis("off")