Fatal error: Uncaught Error: Call to undefined function wp_upload_dir() in /home/ykraanet/public_html/wp-content/plugins/woocommerce-pdf-invoice/libraries/tcpdf/config/tcpdf_config.php:88 Stack trace: #0 /home/ykraanet/public_html/wp-content/plugins/woocommerce-pdf-invoice/libraries/tcpdf/tcpdf_autoconfig.php(65): require_once() #1 /home/ykraanet/public_html/wp-content/plugins/woocommerce-pdf-invoice/libraries/tcpdf/tcpdf.php(111): require_once('/home/ykraanet/...') #2 /home/ykraanet/public_html/wp-content/plugins/woocommerce-pdf-invoice/libraries/tcpdf/tcpdf_import.php(46): require_once('/home/ykraanet/...') #3 {main} thrown in /home/ykraanet/public_html/wp-content/plugins/woocommerce-pdf-invoice/libraries/tcpdf/config/tcpdf_config.php on line 88