Whenever I Try "Airmon-Ng Start wlan0" There's an Error?

Everytime I type in "airmon-ng start wlan0" the following error comes up:

" wlan0 is hard blocked, please flip the hardware wifi switch to on.

It may also be possible to unblock with "rfkill unblock wlan0"

Detected VM using dmiinfo

This appears to be a VirtualBox Virtual Machine

Some distributions have bugs causing rfkill hard block to be forced on in a VM.

If toggling the rfkill hardware switch and "rfkill unblock wlan0" both fail

to fix this, please try not running in a VM.

rfkill error, unable to start wlan0

Would you like to try and automatically resolve this? y/n y

Newly created monitor mode interface wlan0mon is NOT in monitor mode.

Removing non-monitor wlan0mon interface...

WARNING: unable to start monitor mode, please run "airmon-ng check kill""

What should I do? My wireless adapter is a wireless AWUS036H. Thanks in advance!

-Brooku