PKCS10 request generation problem with EC keypair

I need to create PKCS10 request with EC keypairs. But there is an error with request public key every time, I use BC sample test codes for testing below too:

FpCurve curve = new FpCurve(
                new BigInteger("6864797660130609714981900799081393217269435300143305409394463459185543183397656052122559640661454554977296311391480858037121987999716643812574028291115057151"), // q (or p)
                new BigInteger("01FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFC", 16),   // a
                new BigInteger("0051953EB9618E1C9A1F929A21A0B68540EEA2DA725B99B315F3B8B489918EF109E156193951EC7E937B1652C0BD3BB1BF073573DF883D2C34F1EF451FD46B503F00", 16));  // b

            ECDomainParameters spec = new ECDomainParameters(
                curve,
                //              curve.DecodePoint(Hex.Decode("02C6858E06B70404E9CD9E3ECB662395B4429C648139053FB521F828AF606B4D3DBAA14B5E77EFE75928FE1DC127A2FFA8DE3348B3C1856A429BF97E7E31C2E5BD66")), // G
                curve.DecodePoint(Hex.Decode("0200C6858E06B70404E9CD9E3ECB662395B4429C648139053FB521F828AF606B4D3DBAA14B5E77EFE75928FE1DC127A2FFA8DE3348B3C1856A429BF97E7E31C2E5BD66")), // G
                new BigInteger("01FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFA51868783BF2F966B7FCC0148F709A5D03BB5C9B8899C47AEBB6FB71E91386409", 16)); // n

            ECPrivateKeyParameters privKey = new ECPrivateKeyParameters(
                new BigInteger("5769183828869504557786041598510887460263120754767955773309066354712783118202294874205844512909370791582896372147797293913785865682804434049019366394746072023"), // d
                spec);

            ECPublicKeyParameters pubKey = new ECPublicKeyParameters(
                //              curve.DecodePoint(Hex.Decode("026BFDD2C9278B63C92D6624F151C9D7A822CC75BD983B17D25D74C26740380022D3D8FAF304781E416175EADF4ED6E2B47142D2454A7AC7801DD803CF44A4D1F0AC")), // Q
                curve.DecodePoint(Hex.Decode("02006BFDD2C9278B63C92D6624F151C9D7A822CC75BD983B17D25D74C26740380022D3D8FAF304781E416175EADF4ED6E2B47142D2454A7AC7801DD803CF44A4D1F0AC")), // Q
                spec);

            //          //
            //          // set up the keys
            //          //
            //          AsymmetricKeyParameter privKey;
            //          AsymmetricKeyParameter pubKey;
            //
            //          KeyFactory fact = KeyFactory.getInstance("ECDSA");
            //
            //          privKey = fact.generatePrivate(privKeySpec);
            //          pubKey = fact.generatePublic(pubKeySpec);

            Pkcs10CertificationRequest req = new Pkcs10CertificationRequest(
                algorithm, new X509Name("CN=XXX"), pubKey, null, privKey);
            if (!req.Verify())
            {
                Fail("Failed Verify check EC.");
            }

But when i save the PKCS10request as Base64string and open with certutil i encountered such error:

"Signature does not match Public key: 8009310b
Cannot decode object: ASN1 bad tag value met. 0x8009310b (ASN: 267)
CertUtil: -dump command FAILED: 0x8009310b (ASN: 267)
CertUtil: ASN1 bad tag value met."

And the lenght of public key is 0

"Public Key Length: 0 bits"

May be anyone has encountered such error? Thanks in advance!