use search next time. But try this command instead, idk what command you used b4.
aireplay-ng --test wlan0
or
aireplay-ng --test mon0
-------------------------
When I bring my Alfa into monitor mode, i have to use 'airmon-ng start wlan0'
then when i want to start cracking/sniffing/Etc.. I have to use 'mon0' as the interface.
Hope this helps..



