A small questions about using dgk

[YFMao15]

I am using dgk_encrypt and dgk_decrypt on unsigned long integers, but the decrypted results are usually incorrect. I think I use the functions correctly. Here is the piece of code:

(modulus_bit = 2048, length = 64 in dgk_keygen)
dgk_encrypt_crt(c1, pub_key, priv_key, data);
dgk_decrypt(decrypted, pub_key, priv_key, c1);

Any ideas on why variable data is not equal to decrypted after converting them to unsigned long int?

[YFMao15]

Thanks for the ideas from previous post (#7).