ValueError: not enough values to unpack (expected 3, got 2)

[Goyapa]

I tried this, but I got this error-message.
Can you give me some hints how to solve this?

micmac@lambda ~/prog-wiesn/rust-wiesn/ZoZo-Suit/python-version/Zozo-Measurer [16:12:31]

$ ls ⬡ 8.15.1 [±master ✓]
detect_points.py IMG_20180911_163153_c.jpg pycache
ellipse_helpers.py LICENSE README.md
env markers.py requirements.txt

micmac@lambda ~/prog-wiesn/rust-wiesn/ZoZo-Suit/python-version/Zozo-Measurer [16:21:40]

$ python3 -m venv env ⬡ 8.15.1 [±master ✓]
source env/bin/activate

micmac@lambda ~/prog-wiesn/rust-wiesn/ZoZo-Suit/python-version/Zozo-Measurer [16:22:11]
(env) > $ pip install -r requirements.txt ⬡ 8.15.1 [±master ✓]
Requirement already satisfied: numpy in ./env/lib/python3.6/site-packages (from -r requirements.txt (line 1))
Requirement already satisfied: opencv-python in ./env/lib/python3.6/site-packages (from -r requirements.txt (line 2))
Requirement already satisfied: pillow in ./env/lib/python3.6/site-packages (from -r requirements.txt (line 3))

micmac@lambda ~/prog-wiesn/rust-wiesn/ZoZo-Suit/python-version/Zozo-Measurer [16:22:25]
(env) > $ python3 detect_points.py IMG_20180911_163153_c.jpg
Traceback (most recent call last):
File "detect_points.py", line 64, in
point_ids, confidences, positions, distances, raw_data = detect_points(im)
File "detect_points.py", line 18, in detect_points
skewed_points, origins, ellipses = find_marker_ellipses(img)
File "/home/micmac/prog-wiesn/rust-wiesn/ZoZo-Suit/python-version/Zozo-Measurer/markers.py", line 76, in find_marker_ellipses
imgEdge, contours, hierarchy = findContours(th, RETR_TREE, CHAIN_APPROX_NONE)
ValueError: not enough values to unpack (expected 3, got 2)

micmac@lambda ~/prog-wiesn/rust-wiesn/ZoZo-Suit/python-version/Zozo-Measurer [16:22:55]
(env) > $ ⬡ 8.15.1 [±master ✓]

[Goyapa]

and cv2 is installed.

micmac@lambda ~/prog-wiesn/rust-wiesn/ZoZo-Suit/python-version/Zozo-Measurer [16:32:15]
(env) > $ python ⬡ 8.15.1 [±master ✓]
Python 3.6.7 (default, Oct 22 2018, 11:32:17)
[GCC 8.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.

import cv2
cv2.version
'4.0.0'

[pinae]

OpenCV changed the interface of findContours(). It does not return an image anymore. Gladly my code doesn't use the returned image. Just remove imgEdge, in line 76 in https://github.com/pinae/Zozo-Measurer/blob/master/markers.py. Let me know if this solves your problem. I might update the code based on this to cv2 version 4.