Omeka has encountered an error

Zend_Controller_Action_Exception

Context "omeka-json" does not exist

Zend_Controller_Action_Exception: Context "omeka-json" does not exist in /var/www/html/application/libraries/Zend/Controller/Action/Helper/ContextSwitch.php:532
Stack trace:
#0 /var/www/html/application/libraries/Zend/Controller/Action/Helper/ContextSwitch.php(1239): Zend_Controller_Action_Helper_ContextSwitch->hasContext('omeka-json', true)
#1 /var/www/html/application/libraries/Zend/Controller/Action/Helper/ContextSwitch.php(257): Zend_Controller_Action_Helper_ContextSwitch->hasActionContext('browse', 'omeka-json')
#2 /var/www/html/application/libraries/Omeka/Controller/AbstractActionController.php(475): Zend_Controller_Action_Helper_ContextSwitch->initContext()
#3 /var/www/html/application/libraries/Omeka/Controller/AbstractActionController.php(72): Omeka_Controller_AbstractActionController->_setActionContexts()
#4 /var/www/html/application/libraries/Zend/Controller/Dispatcher/Standard.php(281): Omeka_Controller_AbstractActionController->__construct(Object(Zend_Controller_Request_Http), Object(Zend_Controller_Response_Http), Array)
#5 /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))
#6 /var/www/html/application/libraries/Zend/Application/Bootstrap/Bootstrap.php(105): Zend_Controller_Front->dispatch()
#7 /var/www/html/application/libraries/Zend/Application.php(384): Zend_Application_Bootstrap_Bootstrap->run()
#8 /var/www/html/application/libraries/Omeka/Application.php(73): Zend_Application->run()
#9 /var/www/html/index.php(23): Omeka_Application->run()
#10 {main}

Fatal error: Uncaught Zend_Db_Statement_Mysqli_Exception: Mysqli statement execute error : The table 'omeka_sessions' is full in /var/www/html/application/libraries/Zend/Db/Statement/Mysqli.php:215 Stack trace: #0 /var/www/html/application/libraries/Zend/Db/Statement.php(303): Zend_Db_Statement_Mysqli->_execute(Array) #1 /var/www/html/application/libraries/Zend/Db/Adapter/Abstract.php(480): Zend_Db_Statement->execute(Array) #2 /var/www/html/application/libraries/Zend/Db/Adapter/Abstract.php(576): Zend_Db_Adapter_Abstract->query('INSERT INTO `om...', Array) #3 /var/www/html/application/libraries/Zend/Db/Table/Abstract.php(1076): Zend_Db_Adapter_Abstract->insert('omeka_sessions', Array) #4 /var/www/html/application/libraries/Zend/Session/SaveHandler/DbTable.php(356): Zend_Db_Table_Abstract->insert(Array) #5 /var/www/html/application/libraries/Omeka/Session/SaveHandler/DbTable.php(102): Zend_Session_SaveHandler_DbTable->write('p9a151dvnpsb4iu...', Array) #6 [internal function]: Omeka_Session_SaveHandler_DbTable->write('p9a15 in /var/www/html/application/libraries/Zend/Db/Statement/Mysqli.php on line 215