Error Writing T715 certificate

hello octopus team, I have a problem with samsung T715, I can not write the certificate, how can I proceed

Code:

Platform: Samsung Android
Selected port: COM115
Selected model: SM-T715
Selected file: C:\Users\SALVO\Desktop\CF-Auto-Root-gts28lte-
gts28ltexx-smt715\cert-sm-t715y-rf2g7077mnz.cert
Please, press "OK" button on the phone to allow USB debugging..
Please, press "OK" button on the phone to allow USB debugging..
Detected phone model: SM-T715
Firmware compiled date: Tue Jul 19 14:57:02 KST 2016
PDA version: T715XXU2BPG3
CSC version: T715OXA2BPG3
SW version: T715XXU2BPG3
Phone SN: RF2G804FGPA
Android version: 6.0.1 (MMB29K)
Sales code: ITV
Country: ITALY
HW platform: exynos5
HW Chip: exynos5433
HW Modem: SHANNON333
Codename: gts28ltexx
Checking Root:
Phone is Rooted.
Reading security backup, please wait...
Backup saved as C:\Program Files (x86)\Octoplus\Octoplus_Samsung
\BACKUP\Security-SM-T715-Unknown23-10-2016_22-14-48-.asec file
Checking Certificate file...
Certificate file successfully checked
Deactivating MSL...
Executing exploit...
Executing exploit failed
Writing Certificate failed
Performed by 2.4.0 Software version.