Omeka has encountered an error

Zend_Db_Statement_Mysqli_Exception

Mysqli statement execute error : The table 'omeka_sessions' is full

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(664): Zend_Db_Adapter_Abstract->query('DELETE FROM `om...')
#3 /var/www/html/application/libraries/Zend/Db/Table/Abstract.php(1203): Zend_Db_Adapter_Abstract->delete('omeka_sessions', '(`modified` + `...')
#4 /var/www/html/application/libraries/Zend/Session/SaveHandler/DbTable.php(391): Zend_Db_Table_Abstract->delete('`modified` + `l...')
#5 [internal function]: Zend_Session_SaveHandler_DbTable->gc(1209600)
#6 /var/www/html/application/libraries/Zend/Session.php(496): session_start()
#7 /var/www/html/application/libraries/Zend/Session/Namespace.php(143): Zend_Session::start(true)
#8 /var/www/html/application/libraries/Zend/Auth/Storage/Session.php(86): Zend_Session_Namespace->__construct('Zend_Auth')
#9 /var/www/html/application/libraries/Zend/Auth.php(91): Zend_Auth_Storage_Session->__construct()
#10 /var/www/html/application/libraries/Zend/Auth.php(141): Zend_Auth->getStorage()
#11 /var/www/html/application/libraries/Omeka/Application/Resource/Currentuser.php(42): Zend_Auth->hasIdentity()
#12 /var/www/html/application/libraries/Zend/Application/Bootstrap/BootstrapAbstract.php(695): Omeka_Application_Resource_Currentuser->init()
#13 /var/www/html/application/libraries/Zend/Application/Bootstrap/BootstrapAbstract.php(641): Zend_Application_Bootstrap_BootstrapAbstract->_executeResource('Currentuser')
#14 /var/www/html/application/libraries/Zend/Application/Bootstrap/BootstrapAbstract.php(598): Zend_Application_Bootstrap_BootstrapAbstract->_bootstrap('Currentuser')
#15 /var/www/html/application/libraries/Omeka/Application/Resource/Helpers.php(116): Zend_Application_Bootstrap_BootstrapAbstract->bootstrap('Currentuser')
#16 /var/www/html/application/libraries/Omeka/Application/Resource/Helpers.php(27): Omeka_Application_Resource_Helpers->_initAclHelper()
#17 /var/www/html/application/libraries/Zend/Application/Bootstrap/BootstrapAbstract.php(695): Omeka_Application_Resource_Helpers->init()
#18 /var/www/html/application/libraries/Zend/Application/Bootstrap/BootstrapAbstract.php(641): Zend_Application_Bootstrap_BootstrapAbstract->_executeResource('Helpers')
#19 /var/www/html/application/libraries/Zend/Application/Bootstrap/BootstrapAbstract.php(598): Zend_Application_Bootstrap_BootstrapAbstract->_bootstrap('Helpers')
#20 /var/www/html/application/libraries/Omeka/Application/Resource/Frontcontroller.php(63): Zend_Application_Bootstrap_BootstrapAbstract->bootstrap('Helpers')
#21 /var/www/html/application/libraries/Zend/Application/Bootstrap/BootstrapAbstract.php(695): Omeka_Application_Resource_Frontcontroller->init()
#22 /var/www/html/application/libraries/Zend/Application/Bootstrap/BootstrapAbstract.php(638): Zend_Application_Bootstrap_BootstrapAbstract->_executeResource('frontcontroller')
#23 /var/www/html/application/libraries/Zend/Application/Bootstrap/BootstrapAbstract.php(598): Zend_Application_Bootstrap_BootstrapAbstract->_bootstrap('frontcontroller')
#24 /var/www/html/application/libraries/Zend/Application.php(373): Zend_Application_Bootstrap_BootstrapAbstract->bootstrap(NULL)
#25 /var/www/html/application/libraries/Omeka/Application.php(49): Zend_Application->bootstrap()
#26 /var/www/html/index.php(23): Omeka_Application->initialize()
#27 {main}