I installed Opigno 2.10 on my local machine and make some sample courses. I completed one and tried to generate a certificate. The link is like: //localhost/drupal8/opigno/certificate/group/1/pdf It returned the 500 error: The website encountered an unexpected error. Please try again later. I checked the Drupal log, the issue is: Error: Class 'Svg\Document' not found in Dompdf\Helpers::dompdf_getimagesize() (line 620 of /opigno/profiles/opigno_lms/libraries/dompdf/src/Helpers.php) Do your guys know how to solve this problem? I am really appreciated it.