It means your M1 data does not match your H1 data (as an example). You'll want to use period converter script to re-make all time-frames out of the M1 data.

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Hello, I just registred here to see if anyone could help out with some errors I get when I try to backtest,
it is really enoying and stalls things a lot,
the error messages I have been getting is
Test generator unmatched data error volume limit exeeded .
how can I do to be able to backtest again?