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Fatal error: Uncaught Exception: FPDF error: Some data has already been output, can't send PDF file in /home/ncw/domains/ncw.ac.th/public_html/sillapa/public/pdf/fpdf.php:271 Stack trace: #0 /home/ncw/domains/ncw.ac.th/public_html/sillapa/public/pdf/fpdf.php(1060): FPDF->Error('Some data has a...') #1 /home/ncw/domains/ncw.ac.th/public_html/sillapa/public/pdf/fpdf.php(999): FPDF->_checkoutput() #2 /home/ncw/domains/ncw.ac.th/public_html/sillapa/app/views/scores/certificate.php(40): FPDF->Output() #3 /home/ncw/domains/ncw.ac.th/public_html/sillapa/app/libraries/Controller.php(14): require_once('/home/ncw/domai...') #4 /home/ncw/domains/ncw.ac.th/public_html/sillapa/app/controllers/Scores.php(196): Controller->view('scores/certific...', Array) #5 /home/ncw/domains/ncw.ac.th/public_html/sillapa/app/libraries/Core.php(45): Scores->showCertificate('614', '9') #6 /home/ncw/domains/ncw.ac.th/public_html/sillapa/app/require.php(12): Core->__construct() #7 /home/ncw/domains/ncw.ac.th/public_html/sillapa/public/index.php(2): require_once('/home/ncw/domai...') #8 {main} thrown in /home/ncw/domains/ncw.ac.th/public_html/sillapa/public/pdf/fpdf.php on line 271