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I can't reproduce the error message you received, although I can explain why very little (really no) plain text is retrieved from the document: currently our Excel parser only retrieves the string data from xlsx files, which doesn't include numbers, and the sample xlsx file provided almost exclusively contains numeric information.
We will add enhancing the xlsx parser to also include numbers (if keywording digits) to our feature request list.
If you encounter the "data area provided..." error again, please provide any details on how/when it occurs and we will try to reproduce and address it.
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