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Fatal error: Uncaught Error: Call to undefined function potong() in /var/www/html/TCPDF-master/config/tcpdf_config.php:117 Stack trace: #0 /var/www/html/TCPDF-master/tcpdf_autoconfig.php(66): require_once() #1 /var/www/html/TCPDF-master/tcpdf.php(111): require_once('/var/www/html/T...') #2 /var/www/html/pdfviewer.php(6): require_once('/var/www/html/T...') #3 {main} thrown in /var/www/html/TCPDF-master/config/tcpdf_config.php on line 117