G955FXXU2CRED unlock eeror 15?

Checking Login and Password... OK
Ballance: 400 crd.
You have 400 credit(s) left. This operation takes 5 credits.Continue? Yes
Waiting ADB device... OK
Reading phone info...
Model: SM-G955F
Android version: 8.0.0
PDA version: G955FXXU2CRED
CSC version: G955FOXM2CREB
Phone version: G955FXXU2CRE3
Product code: SM-G955FZDDSMA
CSC country code: PHILIPPINES
CSC sales code: SMA
Phone SN: R58J55MDD2P
IMEI: 35911608083
HW version: MP 0.501
RF cal date: 20170525
Chip name: EXYNOS8895
Modem board: SHANNON355
Security patch: 2018-05-01
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.32.6