Strategy Tester 'Unmatched Data Error' - Anyone come across this before? - Details inside

[John Fasheyiku]

Fellas, 

When I test my EA using the optimizer using a period of the past year, I continuously get the error message below 'Unmatched Data Error...'. When I use a shorter time span such as a month or two, the optimizer works and I get the optimized results. 

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Anyone come across this before?

Cheers

John