read codes via server error samsung g920f

hii.my 2 credits are cut and z3x gives error at the end ...
hecking Login and Password... OK
Ballance: 25 crd.
You have 25 credit(s) left. This operation takes 2 credits.Continue? Yes
Waiting ADB device... OK
Reading phone info...
Model: SM-G920F
Android version: 7.0
PDA version: G920FXXU5ERB1
CSC version: G920FTEF5ERB2
Phone version: G920FXXU5ERB1
Product code: SM-G920FZKAO2U
CSC country code: UK & IRE
CSC sales code: O2U
Phone SN: RF8H11HHWZX
IMEI: 357011072658368
HW version: MP 0.91V
RF cal date: 20160119
Chip name: EXYNOS7420
Modem board: SHANNON333
Security patch: 2018-02-01
Boot Warranty bit: 0
Searching server... OK
Checking server answer... modem required
Rebooting phone... OK
Waiting ADB device... 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
Rebooting phone... OK
Waiting for device to become ready... OK
Reading data from phone... OK
Searching server... OK
Waiting for server answer... 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... error (3.8.1)
Reboot phone and try again.
If this repeated then reflash phone and make factory reset.

Done with Samsung Tool PRO v.33.5