An error occurred: [Errno 99] Cannot assign requested address

ArduCopter Copter 4.5
1

I build my drone using the Pixhawk and Raspberry pi4 and I try the MAVProxy its work there is the communication between Pixhawk and Raspberry but when I run the drone arm script this problem appears:

(smartdrone) smartdrone@raspberrypi:~/ardupilot $ python smart.py --connect udp:192.168.1.100:14550

Connecting to vehicle on: udp:192.168.1.100:14550
An error occurred: [Errno 99] Cannot assign requested address

I have this script code with Python for drone arming :

from dronekit import connect, VehicleMode, LocationGlobalRelative, APIException
import time
import math
import socket
import argparse
import geopy.distance

# Connect to the drone
def connectMyCopter():
    parser = argparse.ArgumentParser(description='commands')
    parser.add_argument('--connect')
    args = parser.parse_args()

    connection_string = args.connect
    baud_rate = 115200
    print("\nConnecting to vehicle on: %s" % connection_string)
    vehicle = connect(connection_string, baud=baud_rate, wait_ready=True)
    return vehicle

# Arm the drone
def arm(vehicle):
    while not vehicle.is_armable:
        print("Waiting for vehicle to become armable...")
        time.sleep(1)
    print("Your Vehicle is now armable")

    vehicle.armed = True
    while not vehicle.armed:
        print("Waiting for drone to become armed...")
        time.sleep(1)
    print("Vehicle is now armed... OMG props are spinning, look out!!!!!!!!!!")

    return None

# Main function
if __name__ == "__main__":
    vehicle = connectMyCopter()  # Call the function to connect to the vehicle
    arm(vehicle)  # Arm the vehicle
    print("End of script...")
    vehicle.close()  # Close the connection when done
######################################################################