G960U ATT dont read code

help... tool z3x dont read code to g960u att.. check

Waiting ADB device... OK
Reading phone info...
Model: SM-G960U
Android version: 8.0.0
PDA version: G960USQS3ARG8
CSC version: G960UOYN3ARG8
Phone version: G960USQS3ARG8
Product code: SM2G960UZPAATT
CSC country code: USA
CSC sales code: ATT
Phone SN: R38K6XXXXXX
IMEI: 35481709XXXXXXXX
HW version: REV1.1
RF cal date: 2018.06.14
Chip name: SDM845
Modem board: SDM845
Security patch: 2018-08-01
Boot Warranty bit: 0
Searching Samsung diag port... detected COM35
Reading phone info... OK
Reading data from phone... error (1), skip
Waiting for device to become ready... OK
Initialization zTool... OK
Running zTool, please wait...
Start... OK
Initialization... OK
Generate and check client proof... OK
Verify proof by client... OK
Reading data from phone... OK
Searching Ramdump interface... COM56 detected
Reading data from phone... OK
Calculating...
Exception: Invalid pointer operation
Done with Samsung Tool PRO v.33.8