TCPDF ERROR: Some data has already been output, can't send PDF

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  • Plugin Author Chris Taylor

    (@mrwiblog)

    This normally happens because one of your other plugins sends output to the browser so the PDF generator can’t generate the voucher. Even a single space is enough to break it.

    I suggest you turn off all your plugins except VoucherPress and check a voucher works. Then turn your plugins back on one-by-one, checking your voucher can still works each time. When it breaks the last plugin you turned on is the one causing the problem.

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