FFA installed but not active?

[kenpem]

I have "bought" my FFA license, and followed the steps at http://downloads.digium.com/pub/telephony/fax/README

But when I get to step 5.4 and enter

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fax show stats

I get

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No such command 'fax show stats' (type 'help fax show' for other possible commands)

What did I miss?