Telegram API Bot to invite subscribers of other channels to my own - python-3.x

Question

I want to invite the members of other telegram channels to my channel, but getting this error
THE Error is:
raise ConnectionError('Connection to Telegram failed {} time(s)'.format(self._retries))
ConnectionError: Connection to Telegram failed 5 time(s)
I do not know why I am getting this error, I have checked it with a proxy but it remained the same.
If anyone of you know about this type of error please let me know. I have no idea about this. I do know about this. This is basically a telegram api bot that I want to be completely done with no errors.
import configparser
import json
import asyncio
import sys
import socks
from telethon import TelegramClient
from telethon.tl.types import InputPhoneContact
from telethon.tl.functions.contacts import ImportContactsRequest
from telethon.errors import FloodWaitError, RPCError
#import proxy
from telethon import TelegramClient
from telethon.errors import SessionPasswordNeededError
from telethon.tl.functions.channels import GetParticipantsRequest
from telethon.tl.types import ChannelParticipantsSearch
from telethon.tl.types import (
PeerChannel
)
# Reading Configs
config = configparser.ConfigParser()
config.read("config.ini")
# Setting configuration values
api_id = 1234567
api_hash = 'abcdefghjklmnopqrstuvwxyz1234567'
phone = '[phone]'
username = '#abcdef'
#proxy='180.179.98.22:3128'
# Create the client and connect
client = TelegramClient(username, api_id, api_hash, proxy=(socks.SOCKS5, '166.62.80.198', 18726))
async def main(phone):
await client.start()
print("Client Created")
# Ensure you're authorized
if await client.is_user_authorized() == False:
await client.send_code_request(phone)
try:
await client.sign_in(phone, input('Enter the code: '))
except SessionPasswordNeededError:
await client.sign_in(password=input('Password: '))
me = await client.get_me()
user_input_channel = input("enter entity(telegram URL or entity id):")
if user_input_channel.isdigit():
entity = PeerChannel(int(user_input_channel))
else:
entity = user_input_channel
my_channel = await client.get_entity(entity)
offset = 0
limit = 100
all_participants = []
while True:
participants = await client(GetParticipantsRequest(
my_channel, ChannelParticipantsSearch(''), offset, limit,
hash=0
))
if not participants.users:
break
all_participants.extend(participants.users)
offset += len(participants.users)
all_user_details = []
for participant in all_participants:
all_user_details.append(
{"id": participant.id, "first_name": participant.first_name, "last_name": participant.last_name,
"user": participant.username, "phone": participant.phone, "is_bot": participant.bot})
with open('user_data.json', 'w') as outfile:
json.dump(all_user_details, outfile)
with client:
client.loop.run_until_complete(main(phone))