When I add or modify lines in an invoice, the following message appears:
Warning: Cannot modify header information - headers already sent by (output started at /home/eco88/public_html/erp/htdocs/core/modules/facture/doc/pdf_em2.modules.php:2499) in /home/eco88/public_html/erp/htdocs/main.inc.php on line 793
pdf_em2.modules.php is my invoice template. The rest works fine.
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