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Fatal error: Uncaught Exception: FPDF error: Some data has already been output, can't send PDF file in /home/sillapa/group13/admin/print/fpdf/fpdf.php:273 Stack trace: #0 /home/sillapa/group13/admin/print/fpdf/fpdf.php(1057): FPDF->Error() #1 /home/sillapa/group13/admin/print/fpdf/fpdf.php(1003): FPDF->_checkoutput() #2 /home/sillapa/group13/admin/print/view_cert_student.php(315): FPDF->Output() #3 /home/sillapa/group13/print/cert/dispatch_cert.php(36): include('...') #4 /home/sillapa/group13/print/cert/view_cert_student.php(3): include('...') #5 {main} thrown in /home/sillapa/group13/admin/print/fpdf/fpdf.php on line 273