samsung sm-g965f unlock not done

please see the log .what is eroor?
Checking Login and Password... OK
Ballance: 35 crd.
You have 35 credit(s) left. This operation takes 10 credits.Continue? Yes
Waiting ADB device... OK
Reading phone info...
Model: SM-G965F
Android version: 8.0.0
PDA version: G965FXXU1ARD4
CSC version: G965FOVF1ARD1
Phone version: G965FXXU1ARD7
Product code: SM-G965FZBEVOD
CSC country code: UK
CSC sales code: VOD
Phone SN: RF8K310795W
IMEI: 356575090722506
HW version: MP 0.900
RF cal date: 20180308
Chip name: EXYNOS9810
Modem board: SHANNON360
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... error (0.15)
Done with Samsung Tool PRO v.32.7