O Omeka encontrou um erro

Zend_Db_Statement_Mysqli_Exception

Mysqli statement execute error : Disk full (/tmp/#sql_6e4_0); waiting for someone to free some space...

#0 /var/www/edufes/omeka/application/libraries/Zend/Db/Statement.php(303): Zend_Db_Statement_Mysqli->_execute(Array)
#1 /var/www/edufes/omeka/application/libraries/Zend/Db/Adapter/Abstract.php(480): Zend_Db_Statement->execute(Array)
#2 /var/www/edufes/omeka/application/libraries/Zend/Db/Adapter/Abstract.php(737): Zend_Db_Adapter_Abstract->query('?        SELECT...', Array)
#3 [internal function]: Zend_Db_Adapter_Abstract->fetchAll('?        SELECT...')
#4 /var/www/edufes/omeka/application/libraries/Omeka/Db.php(79): call_user_func_array(Array, Array)
#5 /var/www/edufes/omeka/plugins/CollectionTree/models/Table/CollectionTree.php(135): Omeka_Db->__call('fetchAll', Array)
#6 /var/www/edufes/omeka/plugins/CollectionTree/models/Table/CollectionTree.php(135): Omeka_Db->fetchAll('?        SELECT...')
#7 /var/www/edufes/omeka/plugins/CollectionTree/models/Table/CollectionTree.php(275): Table_CollectionTree->cacheCollections()
#8 /var/www/edufes/omeka/plugins/CollectionTree/models/Table/CollectionTree.php(195): Table_CollectionTree->getCollection(21)
#9 /var/www/edufes/omeka/plugins/CollectionTree/models/Table/CollectionTree.php(173): Table_CollectionTree->getAncestorTree(21, true)
#10 /var/www/edufes/omeka/plugins/CollectionTree/CollectionTreePlugin.php(241): Table_CollectionTree->getCollectionTree(21)
#11 /var/www/edufes/omeka/plugins/CollectionTree/CollectionTreePlugin.php(236): CollectionTreePlugin->_appendToCollectionsShow(Object(Collection))
#12 [internal function]: CollectionTreePlugin->hookPublicCollectionsShow(Array)
#13 /var/www/edufes/omeka/application/libraries/Omeka/Plugin/Broker.php(157): call_user_func(Array, Array)
#14 /var/www/edufes/omeka/application/libraries/globals.php(188): Omeka_Plugin_Broker->callHook('public_collecti...', Array)
#15 /var/www/edufes/omeka/application/views/scripts/collections/show.php(41): fire_plugin_hook('public_collecti...', Array)
#16 /var/www/edufes/omeka/application/libraries/Omeka/View.php(117): include('/var/www/edufes...')
#17 /var/www/edufes/omeka/application/libraries/Zend/View/Abstract.php(888): Omeka_View->_run('/var/www/edufes...')
#18 /var/www/edufes/omeka/application/libraries/Zend/Controller/Action/Helper/ViewRenderer.php(900): Zend_View_Abstract->render('collections/sho...')
#19 /var/www/edufes/omeka/application/libraries/Zend/Controller/Action/Helper/ViewRenderer.php(921): Zend_Controller_Action_Helper_ViewRenderer->renderScript('collections/sho...', NULL)
#20 /var/www/edufes/omeka/application/libraries/Zend/Controller/Action/Helper/ViewRenderer.php(960): Zend_Controller_Action_Helper_ViewRenderer->render()
#21 /var/www/edufes/omeka/application/libraries/Zend/Controller/Action/HelperBroker.php(277): Zend_Controller_Action_Helper_ViewRenderer->postDispatch()
#22 /var/www/edufes/omeka/application/libraries/Zend/Controller/Action.php(527): Zend_Controller_Action_HelperBroker->notifyPostDispatch()
#23 /var/www/edufes/omeka/application/libraries/Zend/Controller/Dispatcher/Standard.php(308): Zend_Controller_Action->dispatch('showAction')
#24 /var/www/edufes/omeka/application/libraries/Zend/Controller/Front.php(954): Zend_Controller_Dispatcher_Standard->dispatch(Object(Zend_Controller_Request_Http), Object(Zend_Controller_Response_Http))
#25 /var/www/edufes/omeka/application/libraries/Zend/Application/Bootstrap/Bootstrap.php(101): Zend_Controller_Front->dispatch()
#26 /var/www/edufes/omeka/application/libraries/Zend/Application.php(366): Zend_Application_Bootstrap_Bootstrap->run()
#27 /var/www/edufes/omeka/application/libraries/Omeka/Application.php(79): Zend_Application->run()
#28 /var/www/edufes/omeka/index.php(23): Omeka_Application->run()
#29 {main}