OSError: [Errno 100] Network is down

[ring-buffer]

I tried to reboot my network service and tried again.
I think something is wrong with scapy module itself.
I did upgrade the scapy and current scapy version is 2.4.0
here's the error I got on python LANs.py -u -p
root@vandan:/home/vandan/Downloads/oscp/Lanpy_spyLANUsers/LANs.py# python LANs.py -u -p
[] Running ARP scan to identify users on the network; this may take a minute - [nmap -sn -n 192.168.2.0/24]
[] Running nbtscan to get Windows netbios names - [nbtscan 192.168.2.0/24]
[*] Enabling monitor mode [airmon-ng start wlp9s0]
Traceback (most recent call last):
File "LANs.py", line 1597, in
LANsMain(args)
File "LANs.py", line 182, in LANsMain
au.users(IPprefix, routerIP)
File "LANs.py", line 1080, in users
sniff(iface=self.monmode, prn=self.pkt_cb, store=0)
File "/usr/local/lib/python2.7/dist-packages/scapy/sendrecv.py", line 731, in sniff
*arg, **karg)] = iface
File "/usr/local/lib/python2.7/dist-packages/scapy/arch/linux.py", line 591, in init
_flush_fd(self.ins)
File "/usr/local/lib/python2.7/dist-packages/scapy/arch/linux.py", line 395, in _flush_fd
os.read(fd,MTU)
OSError: [Errno 100] Network is down