i think FYERS has stopped providing historical option data for expired contracts
even though the symbol name is correct but still getting the error as invalid symbol
this is the code
data = {
"symbol":"NSE:NIFTY25APR22500CE",
"resolution":"5S",
"date_format":"1",
"range_from":"2025-04-21",
"range_to":"2025-04-24",
"cont_flag":"1"
}
data = fyers.history(data=data)
data