Need help about the error 4054 - Incorrect series array using

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I want my EA to open a buy if the price rises above the highest bar´s closeing price of a 1 hour timeframe.

To find the highest closeing price I use: Highest_Bar = iHighest("EURUSD",PERIOD_H1,MODE_CLOSE,Period_Highest_Bar,1) and then Highest_Bar_Price = Close[Highest_Bar];

Now I open a 5 minute offline chart and a 1 hour offline chart and want to run a backtest with my EA. The choosen timeperiod for the backtest is 5 minutes. I always get the error "4054 - Incorrect series array using". The value of Highest_Bar is -1 and of Highest_Bar_Price 0.

What am I doing wrong? Does this not work on a backtest? I need help, please.

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