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Error when following along with docker tutorial

I've been following along with the instructor's examples, specifically on the video where he runs a python application inside an Ubuntu image.

When building my image, I get an error saying

Step 8/9 : COPY alternate.py alternate.py COPY failed: stat /var/lib/docker/tmp/docker-builder222451191/alternate.py: no such file or directory

when running docker images, it confirms that the image did not successfully build

since alerternate.py is never shown in the video, its only referenced, how should I proceed in order to copy what the instructor is doing?