I'm getting an attribute error using tensorflow

[selenanur]

I'm pretty new to python and this code is for object detection, 
it works fine on my webcam but has an error when using an 
external camera This is what I have:

for classId, confidence,box in 
zip(classIds.flatten(),confs.flatten(),bbox):
         cv2.rectangle(img,box,color=(0,255,0),thickness=2)
         
cv2.putText(img,classNames[classId-1].upper(),(box[0]+10,box[1]+30),
                     cv2.FONT_HERSHEY_COMPLEX,1,(0,255,0),2)
Here's the message I got:

Traceback (most recent call last):
   File "C:/Users/byeo9/PycharmProjects/FYP-ENV/Testing 2.py", 
line 31, in <module>
     for classId, confidence,box in 
zip(classIds.flatten(),confs.flatten(),bbox):
AttributeError: 'tuple' object has no attribute 'flatten'