Internal Server Error

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Error code: 500
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    error:
    {"code":"a1c80397","stacktrace":"TypeError: Return value of Materials\\Model\\WorksheetModel::appendElements() must be of the type array, string returned in /var/app/current/module/Materials/src/Model/WorksheetModel.php:469\nStack trace:\n#0 /var/app/current/module/Materials/src/Model/WorksheetModel.php(52): Materials\\Model\\WorksheetModel->appendElements(Object(Application\\Model\\ArrayObject))\n#1 /var/app/current/module/Materials/src/Controller/WorksheetController.php(111): Materials\\Model\\WorksheetModel->appendWorksheetData(Object(Application\\Model\\ArrayObject), 'creator')\n#2 /var/app/current/vendor/laminas/laminas-mvc/src/Controller/AbstractRestfulController.php(373): Materials\\Controller\\WorksheetController->get('dyMbcd6V')\n#3 /var/app/current/module/Application/src/Controller/GeoGebraController.php(93): Laminas\\Mvc\\Controller\\AbstractRestfulController->onDispatch(Object(Laminas\\Mvc\\MvcEvent))\n#4 /var/app/current/vendor/laminas/laminas-eventmanager/src/EventManager.php(319): Application\\Controller\\GeoGebraController->onDispatch(Object(Laminas\\Mvc\\MvcEvent))\n#5 /var/app/current/vendor/laminas/laminas-eventmanager/src/EventManager.php(179): Laminas\\EventManager\\EventManager->triggerListeners(Object(Laminas\\Mvc\\MvcEvent), Object(Closure))\n#6 /var/app/current/vendor/laminas/laminas-mvc/src/Controller/AbstractController.php(97): Laminas\\EventManager\\EventManager->triggerEventUntil(Object(Closure), Object(Laminas\\Mvc\\MvcEvent))\n#7 /var/app/current/vendor/laminas/laminas-mvc/src/Controller/AbstractRestfulController.php(307): Laminas\\Mvc\\Controller\\AbstractController->dispatch(Object(Laminas\\Http\\PhpEnvironment\\Request), Object(Laminas\\Http\\PhpEnvironment\\Response))\n#8 /var/app/current/vendor/laminas/laminas-mvc/src/Controller/Plugin/Forward.php(138): Laminas\\Mvc\\Controller\\AbstractRestfulController->dispatch(Object(Laminas\\Http\\PhpEnvironment\\Request), Object(Laminas\\Http\\PhpEnvironment\\Response))\n#9 /var/app/current/module/Materials/src/Controller/MaterialController.php(156): Laminas\\Mvc\\Controller\\Plugin\\Forward->dispatch('Materials\\\\Contr...', Array)\n#10 /var/app/current/vendor/laminas/laminas-mvc/src/Controller/AbstractRestfulController.php(373): Materials\\Controller\\MaterialController->get('dyMbcd6V')\n#11 /var/app/current/module/Application/src/Controller/GeoGebraController.php(93): Laminas\\Mvc\\Controller\\AbstractRestfulController->onDispatch(Object(Laminas\\Mvc\\MvcEvent))\n#12 /var/app/current/vendor/laminas/laminas-eventmanager/src/EventManager.php(319): Application\\Controller\\GeoGebraController->onDispatch(Object(Laminas\\Mvc\\MvcEvent))\n#13 /var/app/current/vendor/laminas/laminas-eventmanager/src/EventManager.php(179): Laminas\\EventManager\\EventManager->triggerListeners(Object(Laminas\\Mvc\\MvcEvent), Object(Closure))\n#14 /var/app/current/vendor/laminas/laminas-mvc/src/Controller/AbstractController.php(97): Laminas\\EventManager\\EventManager->triggerEventUntil(Object(Closure), Object(Laminas\\Mvc\\MvcEvent))\n#15 /var/app/current/vendor/laminas/laminas-mvc/src/Controller/AbstractRestfulController.php(307): Laminas\\Mvc\\Controller\\AbstractController->dispatch(Object(Laminas\\Http\\PhpEnvironment\\Request), Object(Laminas\\Http\\PhpEnvironment\\Response))\n#16 /var/app/current/vendor/laminas/laminas-mvc/src/DispatchListener.php(132): Laminas\\Mvc\\Controller\\AbstractRestfulController->dispatch(Object(Laminas\\Http\\PhpEnvironment\\Request), Object(Laminas\\Http\\PhpEnvironment\\Response))\n#17 /var/app/current/vendor/laminas/laminas-eventmanager/src/EventManager.php(319): Laminas\\Mvc\\DispatchListener->onDispatch(Object(Laminas\\Mvc\\MvcEvent))\n#18 /var/app/current/vendor/laminas/laminas-eventmanager/src/EventManager.php(179): Laminas\\EventManager\\EventManager->triggerListeners(Object(Laminas\\Mvc\\MvcEvent), Object(Closure))\n#19 /var/app/current/vendor/laminas/laminas-mvc/src/Application.php(325): Laminas\\EventManager\\EventManager->triggerEventUntil(Object(Closure), Object(Laminas\\Mvc\\MvcEvent))\n#20 /var/app/current/public/index.php(43): Laminas\\Mvc\\Application->run()\n#21 {main}"}
    message:
    no error message '/materials/dyMbcd6V?{"embed":"creator","scope":"basic","language":"en"}'