TCPDF error: Some data has already been output to browser

Hi,

I have a big problem with your module. I install it with tcpdf (last version for php 5) with the last version of your module.

In a node, if I push on the "pdf version" button, I don't see the pdf but I have this message :

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$enc=''; $diff=''; $file='dejavusansi.z'; $ ctg='dejavusansi.ctg.z'; $ originalsize=509044; ?> TCPDF error: Some data has already been output to browser, can't send PDF file .

Can you help me ?

thanks