Could you check the WooCommerce logs to see if there are errors with the wpo-wcpdf or fatal-errors prefix? If so, please share the logs with us. You’ll find the logs under WooCommerce > Status > Logs.
2023-11-25T12:25:18+00:00 CRITICAL Uncaught Error: Object of class stdClass could not be converted to string in /home/u15803p11549/domains/winkelteleuk.nl/public_html/wp-content/plugins/woocommerce-pdf-invoices-packing-slips/vendor/dompdf/dompdf/src/Dompdf.php:435 Stack trace: #0 /home/u15803p11549/domains/winkelteleuk.nl/public_html/wp-content/plugins/woocommerce-pdf-invoices-packing-slips/vendor/dompdf/dompdf/src/Dompdf.php(435): mb_convert_encoding(‘<html><body cla…’, ‘UTF-8’, Array) #1 /home/u15803p11549/domains/winkelteleuk.nl/public_html/wp-content/plugins/woo-pdf-invoice-builder/PDFGenerator.php(447): Dompdf\Dompdf->loadHtml(‘<html><body cla…’, Array) #2 /home/u15803p11549/domains/winkelteleuk.nl/public_html/wp-content/plugins/woo-pdf-invoice-builder/PDFGenerator.php(419): RednaoPDFGenerator->render() #3 /home/u15803p11549/domains/winkelteleuk.nl/public_html/wp-content/plugins/woo-pdf-invoice-builder/PDFGenerator.php(279): RednaoPDFGenerator->Generate(true) #4 /home/u15803p11549/domains/winkelteleuk.nl/public_html/wp-content/plugins in /home/u15803p11549/domains/winkelteleuk.nl/public_html/wp-content/plugins/woocommerce-pdf-invoices-packing-slips/vendor/dompdf/dompdf/src/Dompdf.php op de lijn 435
2023-11-29T10:19:10+00:00 CRITICAL Uncaught Error: Object of class stdClass could not be converted to string in /home/u15803p11549/domains/winkelteleuk.nl/public_html/wp-content/plugins/woocommerce-pdf-invoices-packing-slips/vendor/dompdf/dompdf/src/Dompdf.php:435 Stack trace: #0 /home/u15803p11549/domains/winkelteleuk.nl/public_html/wp-content/plugins/woocommerce-pdf-invoices-packing-slips/vendor/dompdf/dompdf/src/Dompdf.php(435): mb_convert_encoding(‘<html><body cla…’, ‘UTF-8’, Array) #1 /home/u15803p11549/domains/winkelteleuk.nl/public_html/wp-content/plugins/woo-pdf-invoice-builder/PDFGenerator.php(447): Dompdf\Dompdf->loadHtml(‘<html><body cla…’, Array) #2 /home/u15803p11549/domains/winkelteleuk.nl/public_html/wp-content/plugins/woo-pdf-invoice-builder/PDFGenerator.php(419): RednaoPDFGenerator->render() #3 /home/u15803p11549/domains/winkelteleuk.nl/public_html/wp-content/plugins/woo-pdf-invoice-builder/PDFGenerator.php(279): RednaoPDFGenerator->Generate(true) #4 /home/u15803p11549/domains/winkelteleuk.nl/public_html/wp-content/plugins in /home/u15803p11549/domains/winkelteleuk.nl/public_html/wp-content/plugins/woocommerce-pdf-invoices-packing-slips/vendor/dompdf/dompdf/src/Dompdf.php op de lijn 435 2023-11-29T10:21:56+00:00 CRITICAL Uncaught Error: Object of class stdClass could not be converted to string in /home/u15803p11549/domains/winkelteleuk.nl/public_html/wp-content/plugins/woocommerce-pdf-invoices-packing-slips/vendor/dompdf/dompdf/src/Dompdf.php:435 Stack trace: #0 /home/u15803p11549/domains/winkelteleuk.nl/public_html/wp-content/plugins/woocommerce-pdf-invoices-packing-slips/vendor/dompdf/dompdf/src/Dompdf.php(435): mb_convert_encoding(‘<html><body cla…’, ‘UTF-8’, Array) #1 /home/u15803p11549/domains/winkelteleuk.nl/public_html/wp-content/plugins/woo-pdf-invoice-builder/PDFGenerator.php(447): Dompdf\Dompdf->loadHtml(‘<html><body cla…’, Array) #2 /home/u15803p11549/domains/winkelteleuk.nl/public_html/wp-content/plugins/woo-pdf-invoice-builder/PDFGenerator.php(419): RednaoPDFGenerator->render() #3 /home/u15803p11549/domains/winkelteleuk.nl/public_html/wp-content/plugins/woo-pdf-invoice-builder/PDFGenerator.php(279): RednaoPDFGenerator->Generate(true) #4 /home/u15803p11549/domains/winkelteleuk.nl/public_html/wp-content/plugins in /home/u15803p11549/domains/winkelteleuk.nl/public_html/wp-content/plugins/woocommerce-pdf-invoices-packing-slips/vendor/dompdf/dompdf/src/Dompdf.php op de lijn 435