An unhandled error occured

Class 'DOMDocument' not found

Stack trace
#0 /home/annasell/public_html/sitemagic/base/SMDataSource.classes.php(83): SMDataSource->ensureDomDocument()
#1 /home/annasell/public_html/sitemagic/base/SMAttributes.class.php(28): SMDataSource->Select('*')
#2 /home/annasell/public_html/sitemagic/base/SMAttributes.class.php(117): SMAttributes::ensureResources()
#3 /home/annasell/public_html/sitemagic/base/SMEnvironment.class.php(245): SMAttributes::GetAttribute('SMEnvironmentSe...')
#4 /home/annasell/public_html/sitemagic/base/SMEnvironment.class.php(21): SMEnvironment::initializeSessions()
#5 /home/annasell/public_html/sitemagic/base/SMController.class.php(95): SMEnvironment::Initialize()
#6 /home/annasell/public_html/sitemagic/base/SMController.class.php(90): SMController->initialization()
#7 /home/annasell/public_html/sitemagic/index.php(26): SMController->__construct()
#8 {main}