Is "NSE:NIFTY50-INDEX" the correct symbol to get historical data. I get error 300 "Please provide a valid symbol" on this when I call the URL https://api.fyers.in:443/data-rest/v2/history/?symbol=NSE%3aNIFTY50-INDEX&resolution=15&date_format=0&range_from=1707719975&range_to=1707892775&cont_flag=1. Can anyone help me with what is wrong with the symbol?