Getting error in cv::imshow() - ASSERT: "false" in file qasciikey.cpp, line 501

Question

I am getting this error whenever I call cv::waitKey():

ASSERT: "false" in file qasciikey.cpp, line 501

I am not sure why I am getting this error. I am running on an Ubuntu Server 14.04 EC2 instance connected through MobaXterm on Windows. If I run all of the same code on a normal ubuntu machine, all works great.

This is the line where this happens:

char key = cvWaitKey(33);

Answer 1

A workaround in MobaXterm is to uncheck "Unix-compatible keyboard" in X11 settings.

Answer 2

Try this.

pip install qtconsole

I solve the problem.