How can I get ecryptfs to mount ~/Private?

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I just reinstalled Fedora 17, and I cannot get ecryptfs to mount my .Private/ to Private/. I tried the following based on the Fedora ecryptfs page:

sudo usermod -a -G ecryptfs username
ecryptfs-recover-private

This mounted private at /tmp/ecryptfs.xxxxxx. I then tried:

ecryptfs-mount-private

and this said something like encrypted directory not properly setup.

Any ideas?