Code error 64 in ZTE F100 unlocking

[e_adrian2001]

I need help. I have a ZTE F100 locked. I try to unlocked using DC-Unlocker Client 1.00.0702 but when the program tries to unblock the telephone gives me an error code 64. I don't know why the program is giving this error.

[Vincentas]

It means you do not have valid username and password or it is incorrect.
Valid username and password you will receive after buy credits. Credits you can buy here: http://www.dc-unlocker.com/buy