Help! I can't revoke my public Key!

[geo909]

Hello to everyone.

I have just started using gpg in Ubuntu and I did some tests, creating keys
etc.
I uploaded one of them (ID is 134FE86D) in
http://pgp.mit.edu/
with the username "Georgios N. Tzanakis" 
and then I tried to revoke it. I did what I have to do and got
the revoke key in the form below:

-----BEGIN PGP PUBLIC KEY BLOCK-----
Version: GnuPG v1.4.6 (GNU/Linux)
Comment: A revocation certificate should follow

<key>
-----END PGP PUBLIC KEY BLOCK-----

 But when I try to submit it (that is, pasting all that to the
"Enter ASCII-armored PGP key here:" field, I get the message:

"Public Key Server -- Add
Key block in add request contained no new
keys, userid's, or signatures.
Your key block contained 1 format errors,
which were treated as if the erroneous elements
hadn't been part of your submission.
The last error was on key 0xffbfb3a8:
Key block corrupt: signature without key"

...and my unwanted key is always there.

Why the revoke key doesn't work?
Am I doing something wrong? (The passphrase and all that are correct).

       Thank you very much for your time.
                             George

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