'get_null' is not defined [LaTex cannot compile]

Hi there everyone,

I've been trying to install manim on my Mac for the past day (newest version of Python), and I'm almost there. Examples 2 and 4 (the non-LaTex examples) work just fine and a video appears in QuickTime. I've been following the blog tutorial (http://bhowell4.com/manic-install-tutorial-for-mac/) religiously. However, I am receiving the following error when I run the command

> python -m manim example_scenes.py -pl

and then select the first, third, or fifth option:

The function get_null() does not seem to be defined anywhere. I do not know where or how to define it, and even changing it back to the original code (replacing it with os.devnull) does not work. This is what the functions in my tex_file_writing.py file look like:

Any help would be greatly appreciated. I would love to start coding!

Best,
Max