Trying to change BLE name on pi

[korenron]

Hello,
I'm trying to make an app that will change the BLE name on command
this is what I have done:

"""Example of how to create a Peripheral device/GATT Server"""
" https://github.com/ukBaz/python-bluezero/issues  "
# Standard modules
import sys
sys.stdout.flush()

import logging
import random

# Bluezero modules
from bluezero import async_tools
from bluezero import adapter
from bluezero import peripheral

from bluezero import dbus_tools
from bluezero import constants

from bluezero import eddystone_beacon
from gpiozero import CPUTemperature


# websocket

import time
import asyncio
import websockets


def ChangeBLE(adapter_address, Sample):
   try:
        Unit_Name = peripheral.Peripheral(adapter_address,
                                            local_name=Sample,
                                            appearance=1344)
    except Exception as e :
        print(e)
    else:
        print('Change the name to : ', Sample)


async def BLEServer(websocket, path):
    NewName= await websocket.recv()
    print('New Data is ' + NewName)
    ChangeBLE(MAC_Addresss, NewName)

    print('finsih changing')
    await asyncio.sleep(5)



print ('BLE App in now UP - can start searching for me  :-) ')
MAC_Addresss = list(adapter.Adapter.available())[0].address
print('Device MAC is ' + MAC_Addresss)
start_server = websockets.serve(BLEServer, '192.168.20.0.100',123456)
asyncio.get_event_loop().run_until_complete(start_server)
asyncio.get_event_loop().run_forever()

it's only working for the first time I get a websocket
then i get this exeption:

pi@raspberrypi:~ $ sudo python3 BlueTooth/BLE_Line.py
BLE App in now UP - can start searching for me  :-)
Device MAC is DC:A6:32:75:54:15
New Data is hello 
Change the name to:  hello
finsih changing
New Data is Alfred
"Can't register the object-path handler for '/ukBaz/bluezero': there is already a handler"
finsih changing
New Data is Danny
"Can't register the object-path handler for '/ukBaz/bluezero': there is already a handler"
finsih changing
New Data is Test
"Can't register the object-path handler for '/ukBaz/bluezero': there is already a handler"
finsih changing

can someone help me understand the problem?