help with wep automation

so i have been working on automating wep fake auth and i got it working and all the sudden it has stopped working. heres the code
[code]MAC=$(macchanger wlan0mon -s | grep "Current" | cut -d ":" -f 2,3,4,5,6,7 | cut -d " " -f 4)
airodump-ng -a --essid ...