Problem with Airmon-Ng and VM

I'am running Kali Linux on the Oracle VM, everything works fine with my Atheros AR9271.

But when i start "airmon-ng start wlan0", it never finishes the command.

When i try to close the terminal and start a new one and type for example "iwconfig" it never finish this command too.

Sorry for my bad english and i hope you can help me. Thank you :)