Need help on upgrading

Error:

Omeka has encountered an error

Zend_Db_Statement_Mysqli_Exception

Mysqli prepare error: Unknown column 'salt' in 'where clause'

#0 /var/www/html/elibrary/application/libraries/Zend/Db/Statement.php(115): Zend_Db_Statement_Mysqli->_prepare('SELECT users....')
#1 /var/www/html/elibrary/application/libraries/Zend/Db/Adapter/Mysqli.php(388): Zend_Db_Statement->__construct(Object(Zend_Db_Adapter_Mysqli), 'SELECT users....')
#2 /var/www/html/elibrary/application/libraries/Zend/Db/Adapter/Abstract.php(479): Zend_Db_Adapter_Mysqli->prepare('SELECT users....')
#3 /var/www/html/elibrary/application/libraries/Zend/Db/Adapter/Abstract.php(756): Zend_Db_Adapter_Abstract->query(Object(Omeka_Db_Select), Array)
#4 [internal function]: Zend_Db_Adapter_Abstract->fetchRow(Object(Omeka_Db_Select), Array)
#5 /var/www/html/elibrary/application/libraries/Omeka/Db.php(79): call_user_func_array(Array, Array)
#6 /var/www/html/elibrary/application/libraries/Omeka/Db/Table.php(612): Omeka_Db->__call('fetchRow', Array)
#7 /var/www/html/elibrary/application/libraries/Omeka/Db/Table.php(612): Omeka_Db->fetchRow(Object(Omeka_Db_Select), Array)
#8 /var/www/html/elibrary/application/libraries/Omeka/Db/Table.php(415): Omeka_Db_Table->fetchObject(Object(Omeka_Db_Select), Array)
#9 /var/www/html/elibrary/application/models/User.php(211): Omeka_Db_Table->findBySql('username = ? AN...', Array, true)
#10 /var/www/html/elibrary/application/controllers/UsersController.php(361): User::upgradeHashedPassword('elibrary', '*********')
#11 /var/www/html/elibrary/application/libraries/Zend/Controller/Action.php(516): UsersController->loginAction()
#12 /var/www/html/elibrary/application/libraries/Zend/Controller/Dispatcher/Standard.php(308): Zend_Controller_Action->dispatch('loginAction')
#13 /var/www/html/elibrary/application/libraries/Zend/Controller/Front.php(954): Zend_Controller_Dispatcher_Standard->dispatch(Object(Zend_Controller_Request_Http), Object(Zend_Controller_Response_Http))
#14 /var/www/html/elibrary/application/libraries/Zend/Application/Bootstrap/Bootstrap.php(97): Zend_Controller_Front->dispatch()
#15 /var/www/html/elibrary/application/libraries/Zend/Application.php(366): Zend_Application_Bootstrap_Bootstrap->run()
#16 /var/www/html/elibrary/application/libraries/Omeka/Application.php(79): Zend_Application->run()
#17 /var/www/html/elibrary/admin/index.php(28): Omeka_Application->run()
#18 {main}

How can I fix this? Thank you in advance

It looks like there was a problem somewhere in updating the User table. Could you tell us what version you are trying to upgrade from and to?

Thank you patrick is that possible I'm upgrading from 1.2.1 to 2.1.2?

and I try to upgrade to 2.0.3 from 1.2.1 still getting same error

Is omeka has compatibility issue on centos 6.2 64bit? coz I use centos 6.2 64bit