Circles is unsubscriptable

Hi!!   I'm trying to run the code for the cpstone_solution where a function is used to differentiate coins in an image.  Even when I just opened the file and didn't make any modifications of any kind, two problems appear (well, one in two lines):  - Value 'circle' is unsubscriptable    This appears for line 29 and 56. I looked up and found that this means that two values are expected and only one is introduced. However, I don't understand why this happens.    the code is like this: def av_pix(img,circles,size):     av_value = []     for coords in circles[0,:]:         col = np.mean(img[coords[1]-size:coords[1]+size,coords[0]-size:coords[0]+size])         #print(img[coords[1]-size:coords[1]+size,coords[0]-size:coords[0]+size])         av_value.append(col)     return av_value   

def get_radius(circles):     radius = []     for coords in circles[0,:]:         radius.append(coords[2])         return radius
img = cv2.imread('capstone_coins.png',cv2.IMREAD_GRAYSCALE) original_image = cv2.imread('capstone_coins.png',1) img = cv2.GaussianBlur(img, (5,5), 0)
circles = cv2.HoughCircles(img,cv2.HOUGH_GRADIENT,0.9,120,param1=50,param2=27,minRadius=60,maxRadius=120)
print(circles)
circles = np.uint16(np.around(circles)) count = 1 for i in circles[0,:]:          # draw the outer circle     cv2.circle(original_image,(i[0],i[1]),i[2],(0,255,0),2)     # draw the center of the circle     cv2.circle(original_image,(i[0],i[1]),2,(0,0,255),3)     #cv2.putText(original_image, str(count),(i[0],i[1]), cv2.FONT_HERSHEY_SIMPLEX, 2, (0,0,0), 2)     count += 1
radii = get_radius(circles) print(radii)
bright_values = av_pix(img,circles,20) print(bright_values)
values = [] for a,b in zip(bright_values,radii):     if a > 150 and b > 110:         values.append(10)     elif a > 150 and b <= 110:         values.append(5)     elif a < 150 and b > 110:         values.append(2)     elif a < 150 and b < 110:         values.append(1)         print(values)            count_2 = 0 for i in circles[0,:]: