Import type 'NinjaTrader (beginning of bar timestamps)': Error on calling 'OnNextDataPoint' method: System.InvalidOperationException: Operation is not valid due to the current state of the object. at NinjaTrader.NinjaScript.ImportTypes.TextImportType .OnNextDataPoint() at NinjaTrader.NinjaScript.ImportTypes.ImportType.Imp ort(MarketDataType marketDataType, TimeZoneInfo sourceTimeZoneInfo, Boolean generateMinuteBars, Boolean generateDailyBars, IProgress progress)
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