Hello, I am currently having a bit of trouble with using scikit-image to align two images using ORB. At the moment, if I try to plot the images, keypoints and matches using plot_matches, I get a plot with only the images and the keypoints and then a large stack trace, attached below. I thought that my code might be the problem, but the same thing occurs if I run one of the ipython notebooks from the skimage-tutorials, specifically /lectures/adv3_panorama-stitching.ipynb, using all of their images, etc. This seems to imply that something is off with my setup. According to `conda list`, I'm using version 0.13.0 of scikit-image. Do any of you have any ideas? Thanks! Riley stack trace: https://pastebin.com/DtGTmmft conda list output: https://pastebin.com/fEzikbi2