Error code when adding new items

We are getting an error code when creating new items. What we notice is that when a new element is added to an existing item type or a new item type is created we get this error message (although a tad different between item types)

Omeka has encountered an error

Zend_Db_Statement_Mysqli_Exception
Mysqli prepare error: Table 'omeka_db.omeka_external_images' doesn't exist
exception 'Zend_Db_Statement_Mysqli_Exception' with message 'Mysqli prepare error: Table 'omeka_db.omeka_external_images' doesn't exist' in /var/www/html/application/libraries/Zend/Db/Statement/Mysqli.php:77
Stack trace:
#0 /var/www/html/application/libraries/Zend/Db/Statement.php(115): Zend_Db_Statement_Mysqli->_prepare('DELETE FROM `om...')
#1 /var/www/html/application/libraries/Zend/Db/Adapter/Mysqli.php(388): Zend_Db_Statement->__construct(Object(Zend_Db_Adapter_Mysqli), 'DELETE FROM `om...')
#2 /var/www/html/application/libraries/Zend/Db/Adapter/Abstract.php(479): Zend_Db_Adapter_Mysqli->prepare('DELETE FROM `om...')
#3 [internal function]: Zend_Db_Adapter_Abstract->query('DELETE FROM `om...')
#4 /var/www/html/application/libraries/Omeka/Db.php(79): call_user_func_array(Array, Array)
#5 /var/www/html/plugins/DigitalObjectLinker/DigitalObjectLinkerPlugin.php(467): Omeka_Db->__call('query', Array)
#6 /var/www/html/plugins/DigitalObjectLinker/DigitalObjectLinkerPlugin.php(467): Omeka_Db->query('DELETE FROM `om...')
#7 [internal function]: DigitalObjectLinkerPlugin->hookBeforeDeleteItem(Array)
#8 /var/www/html/application/libraries/Omeka/Plugin/Broker.php(157): call_user_func(Array, Array)
#9 /var/www/html/application/libraries/Omeka/Record/AbstractRecord.php(298): Omeka_Plugin_Broker->callHook('before_delete_i...', Array)
#10 /var/www/html/application/libraries/Omeka/Record/AbstractRecord.php(580): Omeka_Record_AbstractRecord->runCallbacks('beforeDelete')
#11 /var/www/html/application/libraries/Omeka/Controller/AbstractActionController.php(283): Omeka_Record_AbstractRecord->delete()
#12 /var/www/html/application/libraries/Zend/Controller/Action.php(516): Omeka_Controller_AbstractActionController->deleteAction()
#13 /var/www/html/application/libraries/Zend/Controller/Dispatcher/Standard.php(308): Zend_Controller_Action->dispatch('deleteAction')
#14 /var/www/html/application/libraries/Zend/Controller/Front.php(954): Zend_Controller_Dispatcher_Standard->dispatch(Object(Zend_Controller_Request_Http), Object(Zend_Controller_Response_Http))
#15 /var/www/html/application/libraries/Zend/Application/Bootstrap/Bootstrap.php(105): Zend_Controller_Front->dispatch()
#16 /var/www/html/application/libraries/Zend/Application.php(382): Zend_Application_Bootstrap_Bootstrap->run()
#17 /var/www/html/application/libraries/Omeka/Application.php(79): Zend_Application->run()
#18 /var/www/html/admin/index.php(28): Omeka_Application->run()
#19 {main}

We are running Omeka version 2.3.1.

Thanks for any help you can provide!

This looks like it's some problem with the Digital Object Linker plugin (you can temporarily deactivate it to check).