Omeka has encountered an error

Zend_Db_Statement_Mysqli_Exception

Mysqli statement execute error : Got error 28 from storage engine

exception 'Zend_Db_Statement_Mysqli_Exception' with message 'Mysqli statement execute error : Got error 28 from storage engine' in /var/www/clinton_omeka/application/libraries/Zend/Db/Statement/Mysqli.php:214
Stack trace:
#0 /var/www/clinton_omeka/application/libraries/Zend/Db/Statement.php(303): Zend_Db_Statement_Mysqli->_execute(Array)
#1 /var/www/clinton_omeka/application/libraries/Zend/Db/Adapter/Abstract.php(480): Zend_Db_Statement->execute(Array)
#2 /var/www/clinton_omeka/application/libraries/Zend/Db/Adapter/Abstract.php(811): Zend_Db_Adapter_Abstract->query(Object(Omeka_Db_Select), Array)
#3 [internal function]: Zend_Db_Adapter_Abstract->fetchPairs(Object(Omeka_Db_Select))
#4 /var/www/clinton_omeka/application/libraries/Omeka/Db.php(79): call_user_func_array(Array, Array)
#5 /var/www/clinton_omeka/application/models/Table/Collection.php(77): Omeka_Db->__call('fetchPairs', Array)
#6 /var/www/clinton_omeka/application/models/Table/Collection.php(77): Omeka_Db->fetchPairs(Object(Omeka_Db_Select))
#7 /var/www/clinton_omeka/application/libraries/globals.php(1614): Table_Collection->findPairsForSelectForm(Array)
#8 /var/www/clinton_omeka/application/views/scripts/items/search-form.php(127): get_table_options('Collection', NULL, Array)
#9 /var/www/clinton_omeka/application/libraries/Omeka/View.php(117): include('/var/www/clinto...')
#10 /var/www/clinton_omeka/application/libraries/Zend/View/Abstract.php(888): Omeka_View->_run('/var/www/clinto...')
#11 /var/www/clinton_omeka/application/libraries/Zend/View/Helper/Partial.php(109): Zend_View_Abstract->render('items/search-fo...')
#12 [internal function]: Zend_View_Helper_Partial->partial('items/search-fo...', Array)
#13 /var/www/clinton_omeka/application/libraries/Zend/View/Abstract.php(350): call_user_func_array(Array, Array)
#14 /var/www/clinton_omeka/application/views/scripts/items/search.php(15): Zend_View_Abstract->__call('partial', Array)
#15 /var/www/clinton_omeka/application/views/scripts/items/search.php(15): Omeka_View->partial('items/search-fo...', Array)
#16 /var/www/clinton_omeka/application/libraries/Omeka/View.php(117): include('/var/www/clinto...')
#17 /var/www/clinton_omeka/application/libraries/Zend/View/Abstract.php(888): Omeka_View->_run('/var/www/clinto...')
#18 /var/www/clinton_omeka/application/libraries/Zend/Controller/Action/Helper/ViewRenderer.php(912): Zend_View_Abstract->render('items/search.ph...')
#19 /var/www/clinton_omeka/application/libraries/Zend/Controller/Action/Helper/ViewRenderer.php(933): Zend_Controller_Action_Helper_ViewRenderer->renderScript('items/search.ph...', NULL)
#20 /var/www/clinton_omeka/application/libraries/Zend/Controller/Action/Helper/ViewRenderer.php(972): Zend_Controller_Action_Helper_ViewRenderer->render()
#21 /var/www/clinton_omeka/application/libraries/Zend/Controller/Action/HelperBroker.php(277): Zend_Controller_Action_Helper_ViewRenderer->postDispatch()
#22 /var/www/clinton_omeka/application/libraries/Zend/Controller/Action.php(527): Zend_Controller_Action_HelperBroker->notifyPostDispatch()
#23 /var/www/clinton_omeka/application/libraries/Zend/Controller/Dispatcher/Standard.php(308): Zend_Controller_Action->dispatch('searchAction')
#24 /var/www/clinton_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/clinton_omeka/application/libraries/Zend/Application/Bootstrap/Bootstrap.php(105): Zend_Controller_Front->dispatch()
#26 /var/www/clinton_omeka/application/libraries/Zend/Application.php(384): Zend_Application_Bootstrap_Bootstrap->run()
#27 /var/www/clinton_omeka/application/libraries/Omeka/Application.php(77): Zend_Application->run()
#28 /var/www/clinton_omeka/index.php(23): Omeka_Application->run()
#29 {main}

Fatal error: Uncaught exception 'Zend_Db_Statement_Mysqli_Exception' with message 'Mysqli statement execute error : The table 'omeka_sessions' is full' in /var/www/clinton_omeka/application/libraries/Zend/Db/Statement/Mysqli.php:214 Stack trace: #0 /var/www/clinton_omeka/application/libraries/Zend/Db/Statement.php(303): Zend_Db_Statement_Mysqli->_execute(Array) #1 /var/www/clinton_omeka/application/libraries/Zend/Db/Adapter/Abstract.php(480): Zend_Db_Statement->execute(Array) #2 /var/www/clinton_omeka/application/libraries/Zend/Db/Adapter/Abstract.php(576): Zend_Db_Adapter_Abstract->query('INSERT INTO `om...', Array) #3 /var/www/clinton_omeka/application/libraries/Zend/Db/Table/Abstract.php(1076): Zend_Db_Adapter_Abstract->insert('omeka_sessions', Array) #4 /var/www/clinton_omeka/application/libraries/Zend/Session/SaveHandler/DbTable.php(356): Zend_Db_Table_Abstract->insert(Array) #5 /var/www/clinton_omeka/application/libraries/Omeka/Session/SaveHandler/DbTable.php(102): Zend_Session_SaveHandler_DbTable->write('4ild16m0hs in /var/www/clinton_omeka/application/libraries/Zend/Db/Statement/Mysqli.php on line 214