{'s': 'error', 'code': -300, 'message': 'Please provide a valid symbol'}

I am struggling with an error:
tried finding solutions but none worked. Can you help?

I tried changing Python version. I also created a separate environment. Doesn't help.

Here is my code simplified for testing:
from fyers_api.Websocket import ws

import os

access_token = "eyJ0eXAiOi*****"

app_id= "9y***-100"

access_token = f'{app_id}:{access_token}'

def custom_message(msg):

symbol = msg[0]['symbol']

ltp = msg[0]['ltp']

high = msg[0]['high_price']

low = msg[0]['low_price']

print(f"Symbol: {symbol}, LTP: {ltp}, High: {high}, Low: {low}")

def create_watchlist(access_token):

data_type = "symbolData"

symbols = ["NSE:HDFC-EQ"] # I TRIED USING "NSE:HDFCBANK-EQ" and "NSE:SBIN-EQ"

fs = ws.FyersSocket(access_token=access_token,run_background=False, log_path="/Users/Documents/Algo_trading/")

fs.websocket_data = custom_message

fs.subscribe(symbol=symbols, data_type=data_type)

fs.keep_running()

create_watchlist(access_token)

{'s': 'error', 'code': -300, 'message': 'Please provide a valid symbol'}