Samsung j337a unlocked problem help

pls z3x team am trying to unlocked samsung j337a but am getting error or am doing something wrong

logs
Operation: Read Codes via Server
Selected model: SM-J337A
Software version: 33.5

Checking Login and Password... OK
Ballance: 10 crd.
You have 10 credit(s) left. This operation takes 10 credits.Continue? Yes
Waiting ADB device... OK
Reading phone info...
Model: SM-J337A
Android version: 8.0.0
PDA version: J337AUCU1ARDJ
CSC version: J337AATT1ARDJ
Phone version: J337AUCU1ARDJ
Product code: SM2J337AZKBATT
CSC country code: USA
CSC sales code: ATT
Phone SN: R28K51T217R
IMEI: 356337090720257
HW version: REV0.7
RF cal date: 20180518
Chip name: EXYNOS7570
Modem board: SHANNON305
Security patch: 2018-04-01
Boot Warranty bit: 0
Searching server... OK
Checking server answer... OK
Initialization zTool... OK
Running zTool, please wait...
Start... OK
Initialization... OK
Generate and check client proof... OK
Verify proof by client... OK
Executing... OK
Reading data from phone... OK
Calculating... OK
Searching server... OK
Waiting for server answer... error (1)

Done with Samsung Tool PRO v.33.5