Array showing on invoices

Hi, We have a random “array” appearing on invoices. Running in a test server, get the following error: https://prnt.sc/2200u06

Fatal error: Call to undefined function wpo_wcpdf_templates_get_table_headers()
#0 /home1/todaysa2/public_html/tychesoftwares/staging/woo_chetna/wp-content/plugins/woocommerce-pdf-invoices-packing-slips/includes/documents/abstract-wcpdf-order-document.php(855): include()
#1 /home1/todaysa2/public_html/tychesoftwares/staging/woo_chetna/wp-content/plugins/woocommerce-pdf-invoices-packing-slips/includes/documents/abstract-wcpdf-order-document.php(759): WPO\WC\PDF_Invoices\Documents\Order_Document->render_template('/home1/todaysa2...', Array)
#2 /home1/todaysa2/public_html/tychesoftwares/staging/woo_chetna/wp-content/plugins/woocommerce-pdf-invoices-packing-slips/includes/documents/abstract-wcpdf-order-document.php(741): WPO\WC\PDF_Invoices\Documents\Order_Document->get_html()
#3 /home1/todaysa2/public_html/tychesoftwares/staging/woo_chetna/wp-content/plugins/woocommerce-pdf-invoices-packing-slips/includes/documents/abstract-wcpdf-order-document.php(777): WPO\WC\PDF_Invoices\Documents\Order_Document->get_pdf()
#4 /home1/todaysa2/public_html/tychesoftwares/staging/woo_chetna/wp-content/plugins/woocommerce-pdf-invoices-packing-slips/includes/class-wcpdf-main.php(373): WPO\WC\PDF_Invoices\Documents\Order_Document->output_pdf('inline')
#5 /home1/todaysa2/public_html/tychesoftwares/staging/woo_chetna/wp-includes/class-wp-hook.php(303): WPO\WC\PDF_Invoices\Main->generate_pdf_ajax('')
#6 /home1/todaysa2/public_html/tychesoftwares/staging/woo_chetna/wp-includes/class-wp-hook.php(327): WP_Hook->apply_filters('', Array)
#7 /home1/todaysa2/public_html/tychesoftwares/staging/woo_chetna/wp-includes/plugin.php(470): WP_Hook->do_action(Array)
#8 /home1/todaysa2/public_html/tychesoftwares/staging/woo_chetna/wp-admin/admin-ajax.php(187): do_action('wp_ajax_generat...')
#9 {main}