Injection with Wireless Adapter in Kali 2.0

Hey everyone!

I got my TP-LINK TL-WN722N wireless adapter installed on my Kali, and now i'm trying some WPA/WPA2-PSK crack with Aircrack-ng. The monitor mode worked ok with this commands:

ifconfig wlan0 down

iwconfig wlan0 mode monitor

ifconfig wlan0 up

For some reason I don't know, enable monitor mode with "airmon-ng start wlan0" didn't worked.

With "airodump-ng wlan0", I could see that monitor mode was working normally. But when I tested the injection of my adapter with "aireplay-ng -9 wlan0", it appears the message "Found 0 APs".

How can I make the injection work?

I'm sorry if there is some missing information, truth is i'm new in wi-fi hacking, so I apologize.

Obs.: I'm running with Kali installed in my computer, not in a VM or Live USB.