Lion: Time Machine won't recognize my book driver?

After upgrading to Lion, TM won't recognize mybook drver.  It says "The version of the server you are trying to connect to is not supported.  Please contact your system administrator to solve the problem."  This Wester Digital drvier is been connected via airport extreme for almost a year, and it worked fine on Snow Leopard, since the upgrade it does not see my backup driver.  Any ideas?
Thanks.
M

Same problem here, with Western Digital BlackArmor NAS220.
It seems that Apple changed something with its AFP protocol, used by Time Machine.
In one single word: AMAZING!!!
I guess we have to wait until either Apple or WD releases some patch.

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