When I started to recover the wifi key using reaver 1.4, after writing the command
root@kunjesh-Ideapad-Z570:~/reaver-1.4/src# reaver -i mon0 -b <USSID>
it is giving the error
Reaver v1.4 WiFi Protected Setup Attack Tool
Copyright (c) 2011, Tactical Network Solutions, Craig Heffner <[email protected]>
[-] Failed to initialize interface 'mon0'
[-] Failed to recover WPA key
kindly help me.