siteaccess:
        list:
          - portal_english
          - portal_french
          - site
        groups:
            site_group:
                - portal_french
                - site
                - portal_english

        default_siteaccess: portal_english

        match:
#            URIElement: 1               //This line has been intentionally commented
            Compound\LogicalAnd:
                portal_english:
                    matchers:
                        Map\URI:
                            en: true
                        Map\Host:
                            ezenterprise161-studio-clean.local: true
                    match: portal_english
                french:
                    matchers:
                        Map\URI:
                            french: true
                            fr: true
                        Map\Host:
                            ezenterprise161-studio-clean.local: true
                    match: portal_french

            Map\Host:
                ezenterprise161-studio-clean.local: portal_english

(...)

[1] Symfony\Component\Debug\Exception\ContextErrorException: Notice: Undefined index: portal_english
    at n/a
        in /var/www/html/ezenterprise161_studio_clean/vendor/ezsystems/ezpublish-kernel/eZ/Publish/Core/MVC/Symfony/SiteAccess/Matcher/Compound/LogicalAnd.php line 46

    at Symfony\Component\Debug\ErrorHandler->handleError('8', 'Undefined index: portal_english', '/var/www/html/ezenterprise161_studio_clean/vendor/ezsystems/ezpublish-kernel/eZ/Publish/Core/MVC/Symfony/SiteAccess/Matcher/Compound/LogicalAnd.php', '46', array('siteAccessName' => 'portal_english', 'i' => 'portal_english', 'rule' => array('matchers' => array('Map\URI' => array('en' => true), 'Map\Host' => array('ezenterprise161-studio-clean.local' => true)), 'match' => 'portal_english'), 'subMatchers' => array(), 'this' => object(LogicalAnd)))
        in /var/www/html/ezenterprise161_studio_clean/vendor/ezsystems/ezpublish-kernel/eZ/Publish/Core/MVC/Symfony/SiteAccess/Matcher/Compound/LogicalAnd.php line 46

    at eZ\Publish\Core\MVC\Symfony\SiteAccess\Matcher\Compound\LogicalAnd->reverseMatch('portal_english')
        in /var/www/html/ezenterprise161_studio_clean/vendor/ezsystems/studio-ui-bundle/SiteAccess/ReverseMatcher.php line 55

    at EzSystems\StudioUIBundle\SiteAccess\ReverseMatcher->getMatcher('portal_english')
        in /var/www/html/ezenterprise161_studio_clean/vendor/ezsystems/studio-ui-bundle/SiteAccess/ReverseMatcher.php line 64

    at EzSystems\StudioUIBundle\SiteAccess\ReverseMatcher->getUrlParts('portal_english')
        in /var/www/html/ezenterprise161_studio_clean/vendor/ezsystems/studio-ui-bundle/SiteAccess/ReverseMatcher.php line 95

    at EzSystems\StudioUIBundle\SiteAccess\ReverseMatcher->getUrlRoot('portal_english')
        in /var/www/html/ezenterprise161_studio_clean/vendor/ezsystems/studio-ui-bundle/ApplicationConfig/Providers/SiteAccesses.php line 42

    at EzSystems\StudioUIBundle\ApplicationConfig\Providers\SiteAccesses->getConfig()
        in /var/www/html/ezenterprise161_studio_clean/vendor/ezsystems/platform-ui-bundle/ApplicationConfig/Aggregator.php line 33

    at EzSystems\PlatformUIBundle\ApplicationConfig\Aggregator->getConfig()
        in /var/www/html/ezenterprise161_studio_clean/vendor/ezsystems/platform-ui-bundle/Controller/PlatformUIController.php line 43

    at EzSystems\PlatformUIBundle\Controller\PlatformUIController->shellAction()
        in  line 

    at call_user_func_array(array(object(PlatformUIController), 'shellAction'), array())
        in /var/www/html/ezenterprise161_studio_clean/vendor/symfony/symfony/src/Symfony/Component/HttpKernel/HttpKernel.php line 144

    at Symfony\Component\HttpKernel\HttpKernel->handleRaw(object(Request), '1')
        in /var/www/html/ezenterprise161_studio_clean/vendor/symfony/symfony/src/Symfony/Component/HttpKernel/HttpKernel.php line 64

    at Symfony\Component\HttpKernel\HttpKernel->handle(object(Request), '1', true)
        in /var/www/html/ezenterprise161_studio_clean/vendor/symfony/symfony/src/Symfony/Component/HttpKernel/DependencyInjection/ContainerAwareHttpKernel.php line 69

    at Symfony\Component\HttpKernel\DependencyInjection\ContainerAwareHttpKernel->handle(object(Request), '1', true)
        in /var/www/html/ezenterprise161_studio_clean/vendor/symfony/symfony/src/Symfony/Component/HttpKernel/Kernel.php line 185

    at Symfony\Component\HttpKernel\Kernel->handle(object(Request))
        in /var/www/html/ezenterprise161_studio_clean/web/app.php line 67