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OpenCV Error: Assertion failed (scn == 3 || scn == 4) in cvtColor, file /io/opencv/modules/imgproc/src/color.cpp, line 11111
Traceback (most recent call last):
File "face_eye.py", line 18, in
gray = cv.cvtColor(img, cv.COLOR_BGR2GRAY)
cv2.error: /io/opencv/modules/imgproc/src/color.cpp:11111: error: (-215) scn == 3 || scn == 4 in function cvtColor

I am running WSL through Ubuntu 14.04, X server is failing to load python scripts involving the camera. Tried to install OpenCV again through the tutorial:
https://docs.opencv.org/3.0-beta/doc/tutorials/introduction/linux_install/linux_install.html

Ran into issues with cmake, I just created the CMakeLists.txt file then the cmake command worked

However, now I am stuck at the sudo make install part. The error is:
make: *** No rule to make target install'. Stop.`

Followed this StackExchange answer:
https://askubuntu.com/questions/182715/make-and-make-install-never-work?utm_medium=organic&utm_source=google_rich_qa&utm_campaign=google_rich_qa

Then I got this output:

Reading package lists... Done
Building dependency tree
Reading state information... Done
E: You must put some 'source' URIs in your sources.list

You guys need some screenshots in your README.md

OpenCV Error: Assertion failed (dims <= 2 && step[0] > 0) in locateROI, file /io/opencv/modules/core/src/matrix.cpp, line 991
Traceback (most recent call last):
File "edge_detection.py", line 10, in
laplacian = cv2.Laplacian(frame, cv2.CV_64F)
cv2.error: /io/opencv/modules/core/src/matrix.cpp:991: error: (-215) dims <= 2 && step[0] > 0 in function locateROI

To reproduce the issue, must have Python 2.7 and use Ubuntu 16.04 bash, virtual machine, or dual boot.
Clone this repository and then cd to openCV >GrayScale

Run python grayscale.py

And this error shows up:
Gtk-WARNING **: cannot open display: :0.0