We are on CiviCRM 5.15.1
In trying to pdf print a member list ('Print to PDF') we get the error below.
An error of type E_ERROR was caused in line 274 of the file /home/.../public_html/wp-content/plugins/civicrm/civicrm/vendor/dompdf/dompdf/src/Dompdf.php. Error message: Uncaught Error: Call to undefined function Dompdf\mb_internal_encoding() in /home/.../public_html/wp-content/plugins/civicrm/civicrm/vendor/dompdf/dompdf/src/Dompdf.php:274
Stack trace:
-0 /home/.../public_html/wp-content/plugins/civicrm/civicrm/CRM/Utils/PDF/Utils.php(200): Dompdf\Dompdf->__construct(Object(Dompdf\Options))
-1 /home/.../public_html/wp-content/plugins/civicrm/civicrm/CRM/Utils/PDF/Utils.php(125): CRM_Utils_PDF_Utils::_html2pdf_dompdf(Array, 'landscape', '\n\n