checking created signature failed: bad signature

[Hasnain Mujtaba]

Hi everyone,

I am using GPG 124 to sign a file using the keypair below. I got the
strange error below, which I have never seen before.  Exactly what kind
of check is GPG performing on the created signature? The passphrase for
the keypair is TestingPassphrase.

Regards,
Hasnain. 

gpg --sign -u Bob file1024 

You need a passphrase to unlock the secret key for
user: "Bob C. Omplex <bob at complex.com>"
1024-bit RSA key, ID 8F79C1B7, created 2005-03-08 (main key ID 4CFAD743)

gpg: checking created signature failed: bad signature
gpg: signing failed: bad signature
gpg: signing failed: bad signature


-----BEGIN PGP PRIVATE KEY BLOCK-----
Version: Cryptix OpenPGP 0.20041202

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=s2Mj
-----END PGP PRIVATE KEY BLOCK-----
-----BEGIN PGP PUBLIC KEY BLOCK-----
Version: Cryptix OpenPGP 0.20041202

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=Nnja
-----END PGP PUBLIC KEY BLOCK-----