g925f cert write failed, please how to do it?

I wanted to write cert with the great tool but always never succeeded, please is it problem with octoplus or what else and how will I write the cert file.

Below is the log and am using octoplus version 2.1.0;

Welcome to Octoplus/Octopus Box Samsung software version 2.1.0
-----------------------------------------------------------------------------------
To connect SM-G925F 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.
-----------------------------------------------------------------------------------
Platform: Samsung Android
Selected port: COM4
Selected model: SM-G925F
Searching for a phone. Please wait...
ADB server killed.
Phone found.
Firmware compiled date: Fri Sep 25 16:06:47 KST 2015
PDA version: G925FXXU3COI9
CSC version: G925FWIN3COI6
SW version: G925FXXU3COI9
Phone IMEI: Unknown
Phone SN: 00000000000
Android version: 5.1.1 (LMY47X)
-----------------------------------------------------------------------------------
Platform: Samsung Android
Selected port: COM4
Selected model: SM-G925F
Selected file: D:\offline\samsung\files\G925f\SM-G925F cert file\SM-G925F\cert-sm-g925f_95_359521060917285_95_rf8g31nhw6x.cert
Detected phone model: SM-G925F
Firmware compiled date: Fri Sep 25 16:06:47 KST 2015
PDA version: G925FXXU3COI9
CSC version: G925FWIN3COI6
SW version: G925FXXU3COI9
Phone IMEI: Unknown
Phone SN: 00000000000
Android version: 5.1.1 (LMY47X)
Checking Root:
Phone is Rooted.
Reading security backup, please wait...
Backup saved as C:\Program Files (x86)\Octoplus\Octoplus_Samsung\BACKUP\Security-SM-G925F-Unknown11-11-2015_05-55-30-.asec file
Checking Certificate file...

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g925f cert write failed, please how to do it?