Omeka S encountered an error

Omeka\Mvc\Exception\RuntimeException
Unable to format resources as json-ld.

Details:

Omeka\Mvc\Exception\RuntimeException: Unable to format resources as json-ld. in /home/ewpadmin/public_html/modules/BulkExport/src/Formatter/AbstractFormatter.php:187
Stack trace:
#0 /home/ewpadmin/public_html/modules/BulkExport/src/Controller/ExporterTrait.php(62): BulkExport\Formatter\AbstractFormatter->getResponse()
#1 /home/ewpadmin/public_html/modules/BulkExport/src/Controller/OutputController.php(26): BulkExport\Controller\OutputController->output()
#2 /home/ewpadmin/public_html/vendor/laminas/laminas-mvc/src/Controller/AbstractActionController.php(71): BulkExport\Controller\OutputController->showAction()
#3 /home/ewpadmin/public_html/vendor/laminas/laminas-eventmanager/src/EventManager.php(319): Laminas\Mvc\Controller\AbstractActionController->onDispatch(Object(Laminas\Mvc\MvcEvent))
#4 /home/ewpadmin/public_html/vendor/laminas/laminas-eventmanager/src/EventManager.php(179): Laminas\EventManager\EventManager->triggerListeners(Object(Laminas\Mvc\MvcEvent), Object(Closure))
#5 /home/ewpadmin/public_html/vendor/laminas/laminas-mvc/src/Controller/AbstractController.php(97): Laminas\EventManager\EventManager->triggerEventUntil(Object(Closure), Object(Laminas\Mvc\MvcEvent))
#6 /home/ewpadmin/public_html/vendor/laminas/laminas-mvc/src/DispatchListener.php(132): Laminas\Mvc\Controller\AbstractController->dispatch(Object(Laminas\Http\PhpEnvironment\Request), Object(Laminas\Http\PhpEnvironment\Response))
#7 /home/ewpadmin/public_html/vendor/laminas/laminas-eventmanager/src/EventManager.php(319): Laminas\Mvc\DispatchListener->onDispatch(Object(Laminas\Mvc\MvcEvent))
#8 /home/ewpadmin/public_html/vendor/laminas/laminas-eventmanager/src/EventManager.php(179): Laminas\EventManager\EventManager->triggerListeners(Object(Laminas\Mvc\MvcEvent), Object(Closure))
#9 /home/ewpadmin/public_html/vendor/laminas/laminas-mvc/src/Application.php(325): Laminas\EventManager\EventManager->triggerEventUntil(Object(Closure), Object(Laminas\Mvc\MvcEvent))
#10 /home/ewpadmin/public_html/index.php(21): Laminas\Mvc\Application->run()
#11 {main}