Telegram group scrape people faild

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Python3.3

Hi i try to scrape people in public group , the group is big 7000 people i use this script

client.connect()
if not client.is_user_authorized():
    client.send_code_request(phone)
    client.sign_in(phone, input('Enter the code: '))
 
 
chats = []
last_date = None
chunk_size = 200
groups=[]
 
result = client(GetDialogsRequest(
             offset_date=last_date,
             offset_id=0,
             offset_peer=InputPeerEmpty(),
             limit=chunk_size,
             hash = 0
         ))
chats.extend(result.chats)
 
for chat in chats:
    try:
        if chat.megagroup== True:
            groups.append(chat)
    except:
        continue
 
print('Choose a group to scrape members from:')
i=0
for g in groups:
    print(str(i) + '- ' + g.title)
    i+=1
 
g_index = input("Enter a Number: ")
target_group=groups[int(g_index)]
 
print('Fetching Members...')
all_participants = []
all_participants = client.get_participants(target_group, aggressive=False, limit=5660)
 
print('Saving In file...')
with open("erfan4lx.csv","w",encoding='UTF-8') as f:
    writer = csv.writer(f,delimiter=",",lineterminator="\n")
    writer.writerow(['username','user id', 'access hash','name','group', 'group id'])
    for user in all_participants:
        if user.username:
            username= user.username
        else:
            username= ""
        if user.first_name:
            first_name= user.first_name
        else:
            first_name= ""
        if user.last_name:
            last_name= user.last_name
        else:
            last_name= ""
        name= (first_name + ' ' + last_name).strip()
        writer.writerow([username,user.id,user.access_hash,name,target_group.title, target_group.id])      
print('Members scraped successfully.')
print ('''

if i set limit=5660 work but after this not go and return error , is possible fix it?

What I have tried:

my error

<pre><pre>File "erfan4lx.py", line 69, in <module>
    all_participants = client.get_participants(target_group, aggressive=False, limit=5660)
  File "/home/giulio/.local/lib/python3.8/site-packages/telethon/sync.py", line 39, in syncified
    return loop.run_until_complete(coro)
  File "/usr/lib/python3.8/asyncio/base_events.py", line 616, in run_until_complete
    return future.result()
  File "/home/giulio/.local/lib/python3.8/site-packages/telethon/client/chats.py", line 503, in get_participants
    return await self.iter_participants(*args, **kwargs).collect()
  File "/home/giulio/.local/lib/python3.8/site-packages/telethon/requestiter.py", line 113, in collect
    async for message in self:
  File "/home/giulio/.local/lib/python3.8/site-packages/telethon/requestiter.py", line 74, in __anext__
    if await self._load_next_chunk():
  File "/home/giulio/.local/lib/python3.8/site-packages/telethon/client/chats.py", line 223, in _load_next_chunk
    participants = results[i]