Learn intermediate Javascript: message-mixer

Hi,

I’ve just started the project: Learn intermediate Javascript: message-mixer but on running the first command, I instantly get errors (see picture).
I’m probably overseeing something. Can anyone help?
Thanks!

I think the idea is to type
node message-mixer.js caesar 6
to shift by 6 letters
or
node message-mixer.js symbol
or
node message-mixer.js reverse

Ah, of course. Problem solved. Thanks!

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