ERROR: Use of -r/--rules-file and -g/--rules-generate only allowed in attack mode 0.

[lcrom]

you need to use -a 0 to use --rules-file (or short -r). The same is true for --rules-generate (or short -g), it is only supported with straight/dictionary attack (-a 0).

Ah, okay. I was trying to use the same example as found in this video:

https://youtu.be/KnkjBW3fMVo?t=2m37s

Do you know why it might have been working for her in the video?

I appreciate the help! I just discovered this tool a couple of days ago, so I'm still trying to learn how to use it properly.