Fatal error: Uncaught Mpdf\MpdfException: Invalid size representation "var(--shelly-font-line-h3)" in /home/server698954/ftp/psu/wp-content/plugins/dk-pdf/vendor/mpdf/mpdf/src/SizeConverter.php:35 Stack trace: #0 /home/server698954/ftp/psu/wp-content/plugins/dk-pdf/vendor/mpdf/mpdf/src/Mpdf.php(12591): Mpdf\SizeConverter->convert('var(--shelly-fo...', 4.2333333333333, 4.2333333333333, true) #1 /home/server698954/ftp/psu/wp-content/plugins/dk-pdf/vendor/mpdf/mpdf/src/Mpdf.php(19814): Mpdf\Mpdf->fixLineheight('var(--shelly-fo...') #2 /home/server698954/ftp/psu/wp-content/plugins/dk-pdf/vendor/mpdf/mpdf/src/Tag/BlockTag.php(385): Mpdf\Mpdf->setCSS(Array, 'BLOCK', 'H3') #3 /home/server698954/ftp/psu/wp-content/plugins/dk-pdf/vendor/mpdf/mpdf/src/Tag.php(239): Mpdf\Tag\BlockTag->open(Array, Array, 3) #4 /home/server698954/ftp/psu/wp-content/plugins/dk-pdf/vendor/mpdf/mpdf/src/Mpdf.php(15310): Mpdf\Tag->OpenTag('H3', Array, Array, 3) #5 /home/server698954/ftp/psu/wp-content/plugins/dk-pdf/includes/dkpdf-functions.php(198): Mpdf in /home/server698954/ftp/psu/wp-content/plugins/dk-pdf/vendor/mpdf/mpdf/src/SizeConverter.php on line 35