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Your Marketo admin should set it up in the admin section of Marketo. It's the landing pages setting called "Fallback Page". All that is needed is the URL of a page you want to show in place of a 404 error.
We have that set, but from time to time we still hit the Purple Page of Death.
Before you ask me to send you a link, I'll need to remember which one I was looking at that gave me the error.