j400f Unable to patch certificate

Patch certificate started
Gathering phone info...
Collecting information. Be patient! Do NOT disconnect the phone!
Model: SM-J400F
Sales Code: KSA
Country Code: KSA
Timezone: Asia/Dhaka
Android Version: 8.0.0 [R16NW] [SDK 26]
Build Date: Fri Jul 13 22:01:54 KST 2018
PDA Version: J400FXXU2ARG7 [july 2018, rev7]
Phone Version: J400FXXU2ARG7 [july 2018, rev7]
CSC Version: J400FOJM2ARG7 [july 2018, rev7]
Product Code: KSA
HIDSw Version: J400FXXU2ARG7/J400FOJM2ARG7/J400FXXU2ARG7/J400FXXU2ARG7
Board Platform: EXYNOS5
Modem Platform: SHANNON305
Serial Number: R28K80M1RQV
Imei: 359069090195662
Unique Number: CQE00EE5B9B1065
Connections: AT,MTP
Battery Status: 4.32V (100%)
Network Type: GSM
SIM Status: ABSENT,ABSENT
Multisim Config: DSDS
Knox Version: v30
Warranty Bit: 0
Security Patch: 2018-07-01
Data Encryption State: unencrypted
Preparing...
Checking current patchcert.
Checking modem.
Checking root.
Checking boot image. Be patient! Do NOT disconnect the phone!
The knox is still valid. Because of the boot patch the warranty will void.
Writing boot image.
Restarting phone.
Waiting for ADB connection. Be patient! Do NOT disconnect the phone!
Reading data...
Checking modem version.
Unable to patch certificate.
Finished at local time: [03.15.19 14:22:14]
WorkID: 54792056

Old Security Patch: 2018-07-01 problem?