Unable to Generate PDF

Getting these errors when attempting to generate a PDF, please help.

Warning: A non-numeric value encountered in /var/www/html/wp-content/plugins/wp-advanced-pdf/tcpdf_min/tcpdf.php on line 3422

Warning: A non-numeric value encountered in /var/www/html/wp-content/plugins/wp-advanced-pdf/tcpdf_min/tcpdf.php on line 3424

Warning: Cannot modify header information – headers already sent by (output started at /var/www/html/wp-content/plugins/wp-advanced-pdf/tcpdf_min/tcpdf.php:3422) in /var/www/html/wp-content/plugins/wp-advanced-pdf/wp-advanced-pdf.php on line 607

Warning: Cannot modify header information – headers already sent by (output started at /var/www/html/wp-content/plugins/wp-advanced-pdf/tcpdf_min/tcpdf.php:3422) in /var/www/html/wp-content/plugins/wp-advanced-pdf/wp-advanced-pdf.php on line 608

Warning: Cannot modify header information – headers already sent by (output started at /var/www/html/wp-content/plugins/wp-advanced-pdf/tcpdf_min/tcpdf.php:3422) in /var/www/html/wp-content/plugins/wp-advanced-pdf/wp-advanced-pdf.php on line 609

Warning: Cannot modify header information – headers already sent by (output started at /var/www/html/wp-content/plugins/wp-advanced-pdf/tcpdf_min/tcpdf.php:3422) in /var/www/html/wp-content/plugins/wp-advanced-pdf/wp-advanced-pdf.php on line 610

Warning: Cannot modify header information – headers already sent by (output started at /var/www/html/wp-content/plugins/wp-advanced-pdf/tcpdf_min/tcpdf.php:3422) in /var/www/html/wp-content/plugins/wp-advanced-pdf/wp-advanced-pdf.php on line 612

Warning: Cannot modify header information – headers already sent by (output started at /var/www/html/wp-content/plugins/wp-advanced-pdf/tcpdf_min/tcpdf.php:3422) in /var/www/html/wp-content/plugins/wp-advanced-pdf/wp-advanced-pdf.php on line 613

Warning: Cannot modify header information – headers already sent by (output started at /var/www/html/wp-content/plugins/wp-advanced-pdf/tcpdf_min/tcpdf.php:3422) in /var/www/html/wp-content/plugins/wp-advanced-pdf/wp-advanced-pdf.php on line 614

Warning: Cannot modify header information – headers already sent by (output started at /var/www/html/wp-content/plugins/wp-advanced-pdf/tcpdf_min/tcpdf.php:3422) in /var/www/html/wp-content/plugins/wp-advanced-pdf/wp-advanced-pdf.php on line 632
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