A520W not unlock , getting error

Reading phone info... OK
Model: SM-A520W
AP version: A520WVLS2BRB1
CSC version: A520WOYA2BRB1
CP version: A520WVLS2BRB1
Product code: GLW
Phone SN: R58J70HNNEZ
Unique number: CBJ10490A518244
Searching Samsung diag port... detected COM34
Reading phone info... OK
CP version: A520WVLS2BRB1
CP build: Jan 31 2018 14:20:08
Reading data from phone... error (1)
Done with Samsung Tool PRO v.30.8

how to solve this error