Forum Thread: Aircrack-Ng - Can't Access ieee80211

.I am using kali with virtual box oracle.I have TP LINK wn722n with chip set AR9271 every time when i try to use airmon-ng i recieve this

root@kali:/usr/src# airmon-ng
ls: cannot access /sys/class/ieee80211/: No such file or directory

already killed the proces with check command.Quiding true the troubleshooting and http://www.aircrack-ng.org/doku.php?id=patching I downloaded the patch and when I try to run the patch command always got this error

can't find file to patch at input line 4
Perhaps you used the wrong -p or --strip option?
The text leading up to this was:
--------------------------

|diff -Naur rtl8187linux26.1010.0622.2006orig/beta-8187/ieee80211crypt.h rtl8187linux26.1010.0622.2006rawtx/beta-8187/ieee80211crypt.h

|--- rtl8187linux26.1010.0622.2006orig/beta-8187/ieee80211crypt.h 2006-06-05 22:58:02.000000000 -0400
|+++ rtl8187linux26.1010.0622.2006rawtx/beta-8187/ieee80211crypt.h 2008-08-12 13:11:32.000000000 -0400
--------------------------
File to patch:
I can't navigate to /usr/src/linux so downloaded it in /usr/src and can't do it.Please help