An uncaught Exception was encountered

Type: Error

Message: Call to undefined function Dompdf\mb_internal_encoding()

Filename: /var/www/html/du_edu_bd/dusec/application/views/dompdf/dompdf/src/Dompdf.php

Line Number: 282

Backtrace:

File: /var/www/html/du_edu_bd/dusec/application/views/footer_widget/email_form_pdf.php
Line: 9
Function: __construct

File: /var/www/html/du_edu_bd/dusec/application/controllers/Form.php
Line: 593
Function: view

File: /var/www/html/du_edu_bd/duweb/index.php
Line: 325
Function: require_once