Title: Fatal Error – utf8_encode() Last modified: December 8, 2017 --- # Fatal Error – utf8_encode() * [mistmath](https://wordpress.org/support/users/mistmath/) * (@mistmath) * [8 years, 5 months ago](https://wordpress.org/support/topic/fatal-error-utf8_encode/) * Hello, * I’ve searched on the forum but haven’t been able to solve it by myself 🙁 * I’ve installed the plugin and then I have this ugly fatal error : * > Fatal error: Uncaught Error: Call to undefined function utf8_encode() in /var/ > www/html/wp-content/plugins/woocommerce-pdf-invoices-packing-slips/includes/ > compatibility/mb-string-compatibility.php:17 Stack trace: #0 /var/www/html/ > wp-content/plugins/woocommerce-pdf-invoices-packing-slips/vendor/dompdf/dompdf/ > src/Dompdf.php(428): mb_convert_encoding(‘…’, ‘UTF-8’, ‘iso- > 8859-1’) #1 /var/www/html/wp-content/plugins/woocommerce-pdf-invoices-packing- > slips/includes/class-wcpdf-pdf-maker.php(50): Dompdf\Dompdf->loadHtml(‘ html>…’) #2 /var/www/html/wp-content/plugins/woocommerce-pdf-invoices-packing- > slips/includes/documents/abstract-wcpdf-order-document.php(499): WPO\WC\PDF_Invoices\ > PDF_Maker->output() #3 /var/www/html/wp-content/plugins/woocommerce-pdf-invoices- > packing-slips/includes/documents/abstract-wcpdf-order-document.php(530): WPO\ > WC\PDF_Invoices\Documents\Order_Document->get_pdf() #4 /var/www/html/wp-content/ > plugins/woocommerce-pdf-invoices-packing-slips/includes/class-wcpdf-main.php( > 218): WPO\WC\ in /var/www/html/wp-content/plugins/woocommerce-pdf-invoices- > packing-slips/includes/compatibility/mb-string-compatibility.php on line 17 * I’ve been reading around and I suspect a php7 issue… but I’m not a guru. Can you help me ? * Thank you ! Viewing 2 replies - 1 through 2 (of 2 total) * Plugin Contributor [Ewout](https://wordpress.org/support/users/pomegranate/) * (@pomegranate) * [8 years, 5 months ago](https://wordpress.org/support/topic/fatal-error-utf8_encode/#post-9770095) * Hi! Is this a custom PHP7 setup? The plugin is fully PHP7 compatible and on a normal installation, utf8_encode is a standard function in PHP. Either way, this is already a ‘fallback’ method, it looks like you don’t have the required PHP MBString extension – you may want to check if there’s other things missing. Under WooCommerce > PDF Invoices > Status you can find more information about this. * If you ask you host to enable MBString they should be able to do that for you, it’s a pretty standard extension. * Ewout * Thread Starter [mistmath](https://wordpress.org/support/users/mistmath/) * (@mistmath) * [8 years, 5 months ago](https://wordpress.org/support/topic/fatal-error-utf8_encode/#post-9770132) * Hi, * No this is a standard php7 setup… strange. I’ll dig that point. Thank you. * Mathieu Viewing 2 replies - 1 through 2 (of 2 total) The topic ‘Fatal Error – utf8_encode()’ is closed to new replies. * ![](https://ps.w.org/woocommerce-pdf-invoices-packing-slips/assets/icon-256x256. png?rev=2189942) * [PDF Invoices & Packing Slips for WooCommerce](https://wordpress.org/plugins/woocommerce-pdf-invoices-packing-slips/) * [Frequently Asked Questions](https://wordpress.org/plugins/woocommerce-pdf-invoices-packing-slips/#faq) * [Support Threads](https://wordpress.org/support/plugin/woocommerce-pdf-invoices-packing-slips/) * [Active Topics](https://wordpress.org/support/plugin/woocommerce-pdf-invoices-packing-slips/active/) * [Unresolved Topics](https://wordpress.org/support/plugin/woocommerce-pdf-invoices-packing-slips/unresolved/) * [Reviews](https://wordpress.org/support/plugin/woocommerce-pdf-invoices-packing-slips/reviews/) ## Tags * [mbstring](https://wordpress.org/support/topic-tag/mbstring/) * [PHP7](https://wordpress.org/support/topic-tag/php7/) * 2 replies * 2 participants * Last reply from: [mistmath](https://wordpress.org/support/users/mistmath/) * Last activity: [8 years, 5 months ago](https://wordpress.org/support/topic/fatal-error-utf8_encode/#post-9770132) * Status: not resolved