Initialization zTool... error unlock s6 g920 v33.5

Hi,
i have a problem to ulock a samsung galaxy s6 g920f.
When I try to unlock the box show this:

[ 16/08/2018 17:05:51 ] Operation: Unlock
[ 16/08/2018 17:05:51 ] Selected model: SM-G920F
[ 16/08/2018 17:05:51 ] Software version: 33.5
[ 16/08/2018 17:05:51 ]
[ 16/08/2018 17:05:52 ] Waiting ADB device... Listo
[ 16/08/2018 17:05:56 ] Leyendo información del teléfono ...
[ 16/08/2018 17:05:56 ] Modelo: SM-G920F
[ 16/08/2018 17:05:56 ] Android version: 7.0
[ 16/08/2018 17:05:56 ] PDA version: G920FXXU6ERC1
[ 16/08/2018 17:05:56 ] CSC version: G920FNEE6ERC1
[ 16/08/2018 17:05:56 ] Versión del telefono: G920FXXU6ERC2
[ 16/08/2018 17:05:56 ] Código del Producto: SM-G920FZKANEE
[ 16/08/2018 17:05:56 ] Código de país CSC: Nordic
[ 16/08/2018 17:05:56 ] Código de Venta CSC: NEE
[ 16/08/2018 17:05:57 ] Phone SN: RF8G425656F
[ 16/08/2018 17:05:57 ] IMEI: 359845067420401
[ 16/08/2018 17:05:57 ] HW version: MP 0.800
[ 16/08/2018 17:05:57 ] RF cal date: 20150407
[ 16/08/2018 17:05:57 ] Chip name: EXYNOS7420
[ 16/08/2018 17:05:57 ] Módem: SHANNON333
[ 16/08/2018 17:05:57 ] Security patch: 2018-03-01
[ 16/08/2018 17:05:57 ] Boot Warranty bit: 1
[ 16/08/2018 17:05:57 ] Verificando derecho de Super Usuario... verdadero
[ 16/08/2018 17:06:01 ] Reading NV data... Listo
[ 16/08/2018 17:06:01 ] Checking NV data... Listo
[ 16/08/2018 17:06:01 ] Initialization zTool... error

Can someone help me?
thanks