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並前往https://civicrm.stackexchange.com/questions/16931/mailing-labels-print-tcpdf-error-some-data-has-already-been-output-cant-s

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

php ... that's the only change I had to make. Successfully downloaded my address label pdf in Civi and patted myself on the back.

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