I747M 4.4.2 root but still not unlock
 

I root it with Kingo root, but when try to unlock, I get the error below.

Selected model: I747M
Selected port: COM6 SAMSUNG Mobile USB Serial Port
Selected port speed: 115200
Reading phone info...
Build: M8960A-AAAANAZM-1.0.443139
Done with Samsung Tool v.19.1

Selected model: I747M
Selected port: COM6 SAMSUNG Mobile USB Serial Port
Selected port speed: 115200
Searching ADB device...
Please, allow USB debugging on phone... OK
Reading phone info...
Model: SGH-I747M
Android version: 4.4.2
Product code: SGH-I747MBBBMC
Phone version: I747MVLUFNE6
PDA version: I747MVLUFNE6
CSC version: I747MOYCFNE6
IMEI: 3533230590xxxxx
Phone S/N: R28F70SBVCB
Checking Super user right... false
Not supported version for auto root
Done with Samsung Tool v.19.1

Go to the play store and update the supersu. Or download supersu apk and install.