Error messages at end of calibration

[Neil-99]

I got the following errors at the end of my chessboard calibration:

OpenCV Error: Unspecified error (The function is not implemented. Rebuild the library with Windows, GTK+ 2.x or Carbon support. If you are on Ubuntu or Debian, install libgtk2.0-dev and pkg-config, then re-run cmake or configure script) in cvDestroyAllWindows, file /home/neil/OpenDroneMap/SuperBuild/src/opencv/modules/highgui/src/window.cpp, line 495 Traceback (most recent call last): File "opencv_calibrate.py", line 149, in cv2.destroyAllWindows() cv2.error: /home/neil/OpenDroneMap/SuperBuild/src/opencv/modules/highgui/src/window.cpp:495: error: (-2) The function is not implemented. Rebuild the library with Windows, GTK+ 2.x or Carbon support. If you are on Ubuntu or Debian, install libgtk2.0-dev and pkg-config, then re-run cmake or configure script in function cvDestroyAllWindows

I'm running on Ubuntu 16.04. I have double checked and both of the packages mentioned were already installed. It still generated the calibration files.

[dakotabenjamin]

What version of OpenCV?