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Fatal error: Uncaught Exception: FPDF error: Some data has already been output, can't send PDF file (output started at /home/certificadopolis/public_html/certificacion.php:17) in /home/certificadopolis/public_html/fpdf.php:273 Stack trace: #0 /home/certificadopolis/public_html/fpdf.php(1046): FPDF->Error('Some data has a...') #1 /home/certificadopolis/public_html/fpdf.php(1003): FPDF->_checkoutput() #2 /home/certificadopolis/public_html/certificacion.php(162): FPDF->Output() #3 {main} thrown in /home/certificadopolis/public_html/fpdf.php on line 273