I too guessed the cause as omeka s instance, because of the presence of “Laminas” in the log.
Following is the log i copied from the omekas application.log file after initiating export of a particular item from tropy to omekas
2022-12-02T06:44:17+00:00 ERR (3): Laminas\ServiceManager\Exception\ServiceNotFoundException: A plugin by the name “imageSize” was not found in the plugin manager Laminas\Mvc\Controller\PluginManager in /var/www/omeka-s-3.2.3/vendor/laminas/laminas-servicemanager/src/AbstractPluginManager.php:143
Stack trace:
#0 /var/www/omeka-s-3.2.3/vendor/laminas/laminas-mvc/src/Controller/PluginManager.php(114): Laminas\ServiceManager\AbstractPluginManager->get()
#1 /var/www/omeka-s-3.2.3/modules/ImageServer/Module.php(492): Laminas\Mvc\Controller\PluginManager->get()
#2 /var/www/omeka-s-3.2.3/vendor/laminas/laminas-eventmanager/src/EventManager.php(321): ImageServer\Module->handleBeforeSaveMedia()
#3 /var/www/omeka-s-3.2.3/vendor/laminas/laminas-eventmanager/src/EventManager.php(170): Laminas\EventManager\EventManager->triggerListeners()
#4 /var/www/omeka-s-3.2.3/application/src/Api/Adapter/AbstractEntityAdapter.php(638): Laminas\EventManager\EventManager->triggerEvent()
#5 /var/www/omeka-s-3.2.3/application/src/Api/Adapter/AbstractEntityAdapter.php(341): Omeka\Api\Adapter\AbstractEntityAdapter->hydrateEntity()
#6 /var/www/omeka-s-3.2.3/application/src/Api/Manager.php(224): Omeka\Api\Adapter\AbstractEntityAdapter->create()
#7 /var/www/omeka-s-3.2.3/application/src/Api/Manager.php(78): Omeka\Api\Manager->execute()
#8 /var/www/omeka-s-3.2.3/application/src/Controller/ApiController.php(119): Omeka\Api\Manager->create()
#9 /var/www/omeka-s-3.2.3/application/src/Controller/ApiController.php(195): Omeka\Controller\ApiController->create()
#10 /var/www/omeka-s-3.2.3/vendor/laminas/laminas-mvc/src/Controller/AbstractRestfulController.php(428): Omeka\Controller\ApiController->processPostData()
#11 /var/www/omeka-s-3.2.3/application/src/Controller/ApiController.php(168): Laminas\Mvc\Controller\AbstractRestfulController->onDispatch()
#12 /var/www/omeka-s-3.2.3/vendor/laminas/laminas-eventmanager/src/EventManager.php(321): Omeka\Controller\ApiController->onDispatch()
#13 /var/www/omeka-s-3.2.3/vendor/laminas/laminas-eventmanager/src/EventManager.php(178): Laminas\EventManager\EventManager->triggerListeners()
#14 /var/www/omeka-s-3.2.3/vendor/laminas/laminas-mvc/src/Controller/AbstractController.php(103): Laminas\EventManager\EventManager->triggerEventUntil()
#15 /var/www/omeka-s-3.2.3/vendor/laminas/laminas-mvc/src/Controller/AbstractRestfulController.php(312): Laminas\Mvc\Controller\AbstractController->dispatch()
#16 /var/www/omeka-s-3.2.3/vendor/laminas/laminas-mvc/src/DispatchListener.php(139): Laminas\Mvc\Controller\AbstractRestfulController->dispatch()
#17 /var/www/omeka-s-3.2.3/vendor/laminas/laminas-eventmanager/src/EventManager.php(321): Laminas\Mvc\DispatchListener->onDispatch()
#18 /var/www/omeka-s-3.2.3/vendor/laminas/laminas-eventmanager/src/EventManager.php(178): Laminas\EventManager\EventManager->triggerListeners()
#19 /var/www/omeka-s-3.2.3/vendor/laminas/laminas-mvc/src/Application.php(331): Laminas\EventManager\EventManager->triggerEventUntil()
#20 /var/www/omeka-s-3.2.3/index.php(21): Laminas\Mvc\Application->run()
#21 {main}