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General errors
If there is an error in writing the CustomEMA formula in the MoonBot terminal on the Filters / Base tab of the strategy settings, for example, square brackets were used instead of round brackets, as in your case, then the entry in the filters on the chart will be displayed as follows:
EMA Filters: CustomEMA: Wrong EMA formula (EMA[5m,1]>-1)
To correct the error, replace the square brackets in the formula with round ones.