Picture explorer throws an error when opening a PNG

[mjguzdial]

(My first issue here! I'm teaching with jes4py this coming semester -- see https://guzdial.engin.umich.edu/compfor-221-python-programming-for-digital-media/)

When I try to explore a picture that's created from a PNG, I get a strange error. I can't find where in the code the pictureTool might be opening a JPG file at all.

explore(p)
There was an error trying to write /var/folders/gz/zp7l9f6n4pb8s3g7gnd28hwc0000gn/T/jes4py_uj9w_1a5.jpg
/var/folders/gz/zp7l9f6n4pb8s3g7gnd28hwc0000gn/T/jes4py_uj9w_1a5.jpg does not exist or is not a file
usage: /Users/guzdial/Library/Python/3.10/lib/python/site-packages/jes4py/pictureTool.py file [title]