Hello! I am hoping you can help me solve this data problem using SymbolInd in my backtest. I am using MES as my main chart with SymbolInd (referencing ES) as part of a strategy. I have an IQ Feed paid subscription and real-time access to both indexes. I have specified @MESU25 and @ESU25, so there should be no problems with expired contracts or continuous contracts.
I ran a backtest on 6/16-9/3 (since rollover date), and my charts and indicators loaded fine, with the exception of SymbolInd, which plotted since 8/14 and before that displayed NaN. Suspecting bad data, I clicked to force the strategy to load new data, and now SymbolInd is loading properly since 7/29, and prior to that displays NaN.
The second time this occurred I got an error "Error getting history (@MESU25): The process cannot access the file 'C:\Users\Owner\AppData\Roaming\WealthLab8\IQFeed\TickDataStore
@MESU25_20250623.QXT' because it is being used by another process." I did not get any error the first time I ran the backtest, so I'm not sure if it's relevant?
I ran a backtest on 6/16-9/3 (since rollover date), and my charts and indicators loaded fine, with the exception of SymbolInd, which plotted since 8/14 and before that displayed NaN. Suspecting bad data, I clicked to force the strategy to load new data, and now SymbolInd is loading properly since 7/29, and prior to that displays NaN.
The second time this occurred I got an error "Error getting history (@MESU25): The process cannot access the file 'C:\Users\Owner\AppData\Roaming\WealthLab8\IQFeed\TickDataStore
@MESU25_20250623.QXT' because it is being used by another process." I did not get any error the first time I ran the backtest, so I'm not sure if it's relevant?
Rename
I believe the update with Build 135 fixed this problem, and I'm now able to backtest on the full history of data. However, since then backtesting is causing my Wealth Lab to crash. Very often when I try to click on other screens while a backtest is running it will cause WL to freeze. I also cannot force close WL. I will need to reboot my computer in order to restart WL.
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