why error

Welcome to Octoplus Box Samsung software version 2.6.4
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To connect SM-G935FD phone you have to perform the following
steps:
1. Disconnect USB cable from phone.
2. Go to Menu->Settings->More->About Device.
3.Tap on "Build number" 7 times to enable developer options.
4. Go to Menu->Settings->More->Developer options.
5. Turn on "USB Debugging" option.
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Platform: Samsung Android
Selected port: COM3
Selected model: SM-J530F
Detected phone model: SM-J530F
Firmware compiled date: Wed Dec 27 22:09:51 KST 2017
PDA version: J530FXWU2AQL4
CSC version: J530FOJV2AQL1
SW version: J530FXXU2ARA1
Phone SN: R28J71063ZF
Android version: 7.0 (NRD90M)
Sales code: THR
Country: IRAN
HW platform: exynos5
HW Chip: exynos7870
HW Modem: SHANNON315
Security patch level: 2018-01-01
SIM 1 status: absent
SIM 2 status: absent
Codename: j5y17ltexx
Checking Root:
Phone is Rooted.
Reading security backup, please wait...
Backup saved as C:\Program Files\Octoplus\Octoplus_Samsung
\BACKUP\Security-SM-J530F-R28J71063ZF-07-03-2018_00-20-
01-.asec file
Initializing exploit...
Phone will restart now. Please don't disconnect cable!
Searching for a phone. Please wait...
Phone found.
Executing exploit...
Phone unlocking failed
Performed by 2.6.4 Software version.