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Farkhat Guzairov  

The description of the indicator indicates that before testing, the M1 history for the current instrument is needed. The image below shows an error that says that the history of the current instrument (GBPUSD) ends on 10/26/2020, i.e. more recent history is missing or corrupted, but you can run the tester for the example in the history interval between 10/20/2020 and 10/26/2020. This limitation of the history test for demo indicators was introduced by MQL itself.