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Backtestesting error

Hi, i have a problem with backtesting that maybe someone would be willing to help me with. When i try to backtest my EA it cannot load an indicator, i tried with multiple custom and built-in, niether worked. I run backtests on multiple pairs, usually more than 20, on 10-15 years of daily data. The

Error trying to load ATR

I was coding an ea to trade multiple symbols and have encountered a problem; when backtesting i get an error trying to load ATR: I belive this is the useful part of the code: Here are the parameters i used to backtest: The code works fine when i set my custom period to start later:2015 instead of