Python error ValueError: Unknown network interface None

import scapy.all as scapy
import requests
import json

This code work with API for getting information about venders

def vender_finding(mac_adr):
   mac_url = 'http://macvendors.co/api/%s'
   vender = (requests.get(mac_url % mac_adr))
   response_dict = json.loads(json.dumps(vender.json()))
   return response_dict['result']['company']

This code returns all devices connected to the network. result is something like this

the result of this code

def scan(ip):
   arp_request = scapy.ARP(pdst=ip)
   broadcast = scapy.Ether(dst="ff:ff:ff:ff:ff:ff")
   arp_request_broadcast = broadcast/arp_request

This is the line which gives an error

   answered_list = scapy.srp(arp_request_broadcast, timeout=1, verbose=False)[0]

   clents_list = []
   for element in answered_list[1:]:
      company = vender_finding(element[1].hwsrc)
      clent_dict = {"ip": element[1].psrc, "mac": element[1].hwsrc, "vender": company}
      clents_list.append(clent_dict)
      print(clents_list)
   return clents_list


 scan('192.168.1.0/24')

but now its return error like this. In here now a new error starts to occur.

answered_list = scapy.srp(arp_request_broadcast, timeout=1, verbose=False)[0]

This the error that I am getting.

raise ValueError("Unknown network interface %r" % name)
ValueError: Unknown network interface None