I have been trying to find a solution to the following error with Fern Wifi Cracker for most of the day. Can anyone shed some light on this?

Code:
Fern failed to start scan due to an airodump-ng error: ioctl(SIOCSIWMODE) failed: Device or resource busy ARP linktype is set to 1 (Ethernet) - expected ARPHRD_IEEE80211, ARPHRD_IEEE80211_FULL or ARPHRD_IEEE80211_PRISM instead. Make sure RFMON is enabled: run 'airmon-ng start wlan0 ' Sysfs injection support was not found either.