What is the version of opencv-contrib-python？

[CodingCatMountain]

Dear Sir:
I am going to roslaunch this package，however the opencv-contrib-python reported this error:
"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 cvNamedWindow, file /io/opencv/modules/highgui/src/window.cpp, line 565
Traceback (most recent call last):"
What should I do?
My environment: Ubuntu 18.04
Ros version==Melodic
python 2.7
opencv-contrib-python version==3.2.0.7