When using, with Zorro S, marketVol(0) in a script with OANDA, what data is OANDA giving me? Using M1 Data.

When trading in backtest, no problem, but when trading Real I get the following error:

Error 063: marketVol not available.

Why does it work in backtest and not in real? Data has been downloaded from Oanda with Download script so backtest is run with Oanda data.

What data is supposed to give me Oanda with marketVol?

Any help would be appreciated thank you.