Error on Unlock Lumia 521


Hello, after I flashed this Lumia, i try to unlock it, but i got this:
WP8 Unlock Started
Connecting to server…
Connected
Authenticating…
Authenticated
Checking Client version…
Client version is valid
Processing Step #1 At thi point got stuck and then show this error:

Now credits are GONE, and program get stuck at this:
Link to my account: http://user.infinity-best.com
Login: lumia11170

Connecting to server…

Credits: 0

Phone found!
WP10/WP8x Lumia Phone detected
Read info… Ok

WP8 Unlock Started
Connecting to server…
Connected
Authenticating…

Just to clear, phone is not unlocked