Uncaught Mpdf\MpdfException: Data has already been sent to output, unable to output PDF file
in /home/uqkawubb/public_html/wp-content/plugins/woocommerce-invoice-pro/vendor/mpdf/mpdf/src/Mpdf.php on line 9605
Call stack:
Mpdf\Mpdf::Output('pre-invoice(1780629161).pdf', 'D')WIP_PDF_Generator::download()include('/home/uqkawubb/publi...ates/pre-invoice.php')require_once('/home/uqkawubb/publi.../template-loader.php')require('/home/uqkawubb/public_html/wp-blog-header.php')