A500FU unlock error 2

I try unlock A500FU with android 6.0.1 but give me error 2
Operation: Unlock
Selected model: SM-A500FU
Selected port: COM97 SAMSUNG Mobile USB Serial Port
Software version: 36.2
Reading phone info...
Reading IMEI... OK
IMEI: 35946906130xxxx
Unlocking... error (02)
Done with Samsung Tool PRO v.36.2
How can exacttly unlock this phone with Z3X ? Thanks in advance for your help !