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

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

[chawzi]

i've been having this problem for days, pdf generation works on local host but not on live server