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Fatal error: Uncaught Exception: FPDF error: Some data has already been output, can't send PDF file in /var/www/webroot/ROOT/nui__mvc__model/ext_fpdf/fpdf.php:271 Stack trace: #0 /var/www/webroot/ROOT/nui__mvc__model/ext_fpdf/fpdf.php(1060): FPDF->Error('Some data has a...') #1 /var/www/webroot/ROOT/nui__mvc__model/ext_fpdf/fpdf.php(999): FPDF->_checkoutput() #2 /var/www/webroot/ROOT/nui__data/processing__document.php(3259): FPDF->Output('I', 'MN013512.pdf', false) #3 {main} thrown in /var/www/webroot/ROOT/nui__mvc__model/ext_fpdf/fpdf.php on line 271