[R] order.by requires an appropriate time-based object

[Allan Tanaka]

HiNot sure why i get error like this: Error in xts(forecasts, dates[(window.length):length(returns)]) :   order.by requires an appropriate time-based object
I have researched for the answer that i need to convert returns into time series. I did that but still it doesn't work?See attached for file.Thanks
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