Fatal error: Uncaught Error: Class 'DOMDocument' not found in /var/www/cops2-demo/api/app/src/Cops/Factory/XHtmlConverterService.php:39 Stack trace: #0 /var/www/cops2-demo/api/app/src/Cops/Controller/OPDSBookListAbstract.php(182): Cops\Factory\XHtmlConverterService->html2xhtml() #1 /var/www/cops2-demo/api/app/src/Cops/Controller/OPDSBookList.php(36): Cops\Controller\OPDSBookListAbstract->generateEntries() #2 /var/www/cops2-demo/api/app/src/Cops/Controller/OPDSControllerAbstract.php(224): Cops\Controller\OPDSBookList->getLocalData() #3 /var/www/cops2-demo/api/app/models.php(30): Cops\Controller\OPDSControllerAbstract->getData() #4 [internal function]: {closure}() #5 /var/www/cops2-demo/api/vendor/vlucas/bulletphp/src/Bullet/App.php(285): call_user_func() #6 /var/www/cops2-demo/api/index.php(24): Bullet\App->run() #7 {main} thrown in /var/www/cops2-demo/api/app/src/Cops/Factory/XHtmlConverterService.php on line 39