Omeka has encountered an error

Zend_Session_Exception

Zend_Session::start() - /nfs/bronfs/uwfs/hw00/d47/momara/omeka/application/libraries/Zend/Db/Table/Abstract.php(Line:1305): Error #2 count(): Parameter must be an array or an object that implements Countable
/nfs/bronfs/uwfs/hw00/d47/momara/omeka/application/libraries/Zend/Db/Table/Abstract.php(Line:1305): Error #2 count(): Parameter must be an array or an object that implements Countable

#0 /nfs/bronfs/uwfs/hw00/d47/momara/omeka/application/libraries/Zend/Session/Namespace.php(143): Zend_Session::start(true)
#1 /nfs/bronfs/uwfs/hw00/d47/momara/omeka/application/libraries/Zend/Auth/Storage/Session.php(87): Zend_Session_Namespace->__construct('Zend_Auth')
#2 /nfs/bronfs/uwfs/hw00/d47/momara/omeka/application/libraries/Zend/Auth.php(91): Zend_Auth_Storage_Session->__construct()
#3 /nfs/bronfs/uwfs/hw00/d47/momara/omeka/application/libraries/Zend/Auth.php(141): Zend_Auth->getStorage()
#4 /nfs/bronfs/uwfs/hw00/d47/momara/omeka/application/libraries/Omeka/Application/Resource/Currentuser.php(42): Zend_Auth->hasIdentity()
#5 /nfs/bronfs/uwfs/hw00/d47/momara/omeka/application/libraries/Zend/Application/Bootstrap/BootstrapAbstract.php(683): Omeka_Application_Resource_Currentuser->init()
#6 /nfs/bronfs/uwfs/hw00/d47/momara/omeka/application/libraries/Zend/Application/Bootstrap/BootstrapAbstract.php(629): Zend_Application_Bootstrap_BootstrapAbstract->_executeResource('Currentuser')
#7 /nfs/bronfs/uwfs/hw00/d47/momara/omeka/application/libraries/Zend/Application/Bootstrap/BootstrapAbstract.php(586): Zend_Application_Bootstrap_BootstrapAbstract->_bootstrap('Currentuser')
#8 /nfs/bronfs/uwfs/hw00/d47/momara/omeka/application/libraries/Omeka/Application/Resource/Helpers.php(122): Zend_Application_Bootstrap_BootstrapAbstract->bootstrap('Currentuser')
#9 /nfs/bronfs/uwfs/hw00/d47/momara/omeka/application/libraries/Omeka/Application/Resource/Helpers.php(27): Omeka_Application_Resource_Helpers->_initAclHelper()
#10 /nfs/bronfs/uwfs/hw00/d47/momara/omeka/application/libraries/Zend/Application/Bootstrap/BootstrapAbstract.php(683): Omeka_Application_Resource_Helpers->init()
#11 /nfs/bronfs/uwfs/hw00/d47/momara/omeka/application/libraries/Zend/Application/Bootstrap/BootstrapAbstract.php(629): Zend_Application_Bootstrap_BootstrapAbstract->_executeResource('Helpers')
#12 /nfs/bronfs/uwfs/hw00/d47/momara/omeka/application/libraries/Zend/Application/Bootstrap/BootstrapAbstract.php(586): Zend_Application_Bootstrap_BootstrapAbstract->_bootstrap('Helpers')
#13 /nfs/bronfs/uwfs/hw00/d47/momara/omeka/application/libraries/Omeka/Application/Resource/Frontcontroller.php(63): Zend_Application_Bootstrap_BootstrapAbstract->bootstrap('Helpers')
#14 /nfs/bronfs/uwfs/hw00/d47/momara/omeka/application/libraries/Zend/Application/Bootstrap/BootstrapAbstract.php(683): Omeka_Application_Resource_Frontcontroller->init()
#15 /nfs/bronfs/uwfs/hw00/d47/momara/omeka/application/libraries/Zend/Application/Bootstrap/BootstrapAbstract.php(626): Zend_Application_Bootstrap_BootstrapAbstract->_executeResource('frontcontroller')
#16 /nfs/bronfs/uwfs/hw00/d47/momara/omeka/application/libraries/Zend/Application/Bootstrap/BootstrapAbstract.php(586): Zend_Application_Bootstrap_BootstrapAbstract->_bootstrap('frontcontroller')
#17 /nfs/bronfs/uwfs/hw00/d47/momara/omeka/application/libraries/Zend/Application.php(355): Zend_Application_Bootstrap_BootstrapAbstract->bootstrap(NULL)
#18 /nfs/bronfs/uwfs/hw00/d47/momara/omeka/application/libraries/Omeka/Application.php(51): Zend_Application->bootstrap()
#19 /nfs/bronfs/uwfs/hw00/d47/momara/omeka/index.php(23): Omeka_Application->initialize()
#20 {main}