Fatal error: Uncaught Error: Call to a member function get() on null in /opt/omeka-s/application/src/Api/Representation/AbstractRepresentation.php:82 Stack trace: #0 /opt/omeka-s/application/src/Api/Representation/AbstractResourceRepresentation.php(75): Omeka\Api\Representation\AbstractRepresentation->getViewHelper() #1 [internal function]: Omeka\Api\Representation\AbstractResourceRepresentation->jsonSerialize() #2 /opt/omeka-s/vendor/laminas/laminas-json/src/Json.php(384): json_encode() #3 /opt/omeka-s/vendor/laminas/laminas-json/src/Json.php(349): Laminas\Json\Json::encodeViaPhpBuiltIn() #4 /opt/omeka-s/vendor/laminas/laminas-json/src/Json.php(121): Laminas\Json\Json::encodeValue() #5 /opt/omeka-s/vendor/laminas/laminas-view/src/Renderer/JsonRenderer.php(150): Laminas\Json\Json::encode() #6 /opt/omeka-s/application/src/View/Renderer/ApiJsonRenderer.php(71): Laminas\View\Renderer\JsonRenderer->render() #7 /opt/omeka-s/vendor/laminas/laminas-view/src/View.php(194): Omeka\View\Renderer\ApiJsonRenderer->render() #8 /opt/omeka-s/vendor/laminas/laminas-mvc/src/View/Http/DefaultRenderingStrategy.php(98): Laminas\View\View->render() #9 /opt/omeka-s/vendor/laminas/laminas-eventmanager/src/EventManager.php(319): Laminas\Mvc\View\Http\DefaultRenderingStrategy->render() #10 /opt/omeka-s/vendor/laminas/laminas-eventmanager/src/EventManager.php(171): Laminas\EventManager\EventManager->triggerListeners() #11 /opt/omeka-s/vendor/laminas/laminas-mvc/src/View/Http/DefaultRenderingStrategy.php(116): Laminas\EventManager\EventManager->triggerEvent() #12 /opt/omeka-s/vendor/laminas/laminas-eventmanager/src/EventManager.php(319): Laminas\Mvc\View\Http\DefaultRenderingStrategy->render() #13 /opt/omeka-s/vendor/laminas/laminas-eventmanager/src/EventManager.php(171): Laminas\EventManager\EventManager->triggerListeners() #14 /opt/omeka-s/vendor/laminas/laminas-mvc/src/Application.php(360): Laminas\EventManager\EventManager->triggerEvent() #15 /opt/omeka-s/vendor/laminas/laminas-mvc/src/Application.php(341): Laminas\Mvc\Application->completeRequest() #16 /opt/omeka-s/index.php(21): Laminas\Mvc\Application->run() #17 {main} thrown in /opt/omeka-s/application/src/Api/Representation/AbstractRepresentation.php on line 82