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 You have requested a non-existent service "ezpublish_legacy.kernel". Did you mean one of these: "ezpublish_legacy.router", "ezpublish_legacy.kernel.lazy_loader", "ezpublish_legacy.kernel_handler.web", "ezpublish_legacy.kernel.lazy"?
500 Internal Server Error - ServiceNotFoundException 

[1] Symfony\Component\DependencyInjection\Exception\ServiceNotFoundException: You have requested a non-existent service "ezpublish_legacy.kernel". Did you mean one of these: "ezpublish_legacy.router", "ezpublish_legacy.kernel.lazy_loader", "ezpublish_legacy.kernel_handler.web", "ezpublish_legacy.kernel.lazy"?
    at n/a
        in /var/www/ezpublish54_EZP-23883/vendor/symfony/symfony/src/Symfony/Component/DependencyInjection/Container.php line 300

    at Symfony\Component\DependencyInjection\Container->get('ezpublish_legacy.kernel')
        in /var/www/ezpublish54_EZP-23883/vendor/ezsystems/ezpublish-kernel/eZ/Publish/Core/MVC/Legacy/Kernel/Loader.php line 316

    at eZ\Publish\Core\MVC\Legacy\Kernel\Loader->resetKernel()
        in /var/www/ezpublish54_EZP-23883/vendor/ezsystems/ezpublish-kernel/eZ/Bundle/EzPublishLegacyBundle/EventListener/ConfigScopeListener.php line 38

    at eZ\Bundle\EzPublishLegacyBundle\EventListener\ConfigScopeListener->onConfigScopeChange(object(ScopeChangeEvent), 'ezpublish.config.scope_restore', object(TraceableEventDispatcher))
        in  line 

    at call_user_func(array(object(ConfigScopeListener), 'onConfigScopeChange'), object(ScopeChangeEvent), 'ezpublish.config.scope_restore', object(TraceableEventDispatcher))
        in /var/www/ezpublish54_EZP-23883/vendor/symfony/symfony/src/Symfony/Component/EventDispatcher/Debug/WrappedListener.php line 61

    at Symfony\Component\EventDispatcher\Debug\WrappedListener->__invoke(object(ScopeChangeEvent), 'ezpublish.config.scope_restore', object(ContainerAwareEventDispatcher))
        in  line 

    at call_user_func(object(WrappedListener), object(ScopeChangeEvent), 'ezpublish.config.scope_restore', object(ContainerAwareEventDispatcher))
        in /var/www/ezpublish54_EZP-23883/vendor/symfony/symfony/src/Symfony/Component/EventDispatcher/EventDispatcher.php line 158

    at Symfony\Component\EventDispatcher\EventDispatcher->doDispatch(array(object(WrappedListener), object(WrappedListener), object(WrappedListener)), 'ezpublish.config.scope_restore', object(ScopeChangeEvent))
        in /var/www/ezpublish54_EZP-23883/vendor/symfony/symfony/src/Symfony/Component/EventDispatcher/EventDispatcher.php line 46

    at Symfony\Component\EventDispatcher\EventDispatcher->dispatch('ezpublish.config.scope_restore', object(ScopeChangeEvent))
        in /var/www/ezpublish54_EZP-23883/vendor/symfony/symfony/src/Symfony/Component/EventDispatcher/Debug/TraceableEventDispatcher.php line 124

    at Symfony\Component\EventDispatcher\Debug\TraceableEventDispatcher->dispatch('ezpublish.config.scope_restore', object(ScopeChangeEvent))
        in /var/www/ezpublish54_EZP-23883/vendor/ezsystems/ezpublish-kernel/eZ/Publish/Core/Helper/ContentPreviewHelper.php line 96

    at eZ\Publish\Core\Helper\ContentPreviewHelper->restoreConfigScope()
        in /var/www/ezpublish54_EZP-23883/vendor/ezsystems/ezpublish-kernel/eZ/Publish/Core/MVC/Symfony/Controller/Content/PreviewController.php line 116

    at eZ\Publish\Core\MVC\Symfony\Controller\Content\PreviewController->previewContentAction('150', '4', 'eng-GB', 'ezdemo_site_user')
        in  line 

    at call_user_func_array(array(object(PreviewController), 'previewContentAction'), array('150', '4', 'eng-GB', 'ezdemo_site_user'))
        in /var/www/ezpublish54_EZP-23883/vendor/symfony/symfony/src/Symfony/Component/HttpKernel/HttpKernel.php line 139

    at Symfony\Component\HttpKernel\HttpKernel->handleRaw(object(Request), '1')
        in /var/www/ezpublish54_EZP-23883/vendor/symfony/symfony/src/Symfony/Component/HttpKernel/HttpKernel.php line 62

    at Symfony\Component\HttpKernel\HttpKernel->handle(object(Request), '1', true)
        in /var/www/ezpublish54_EZP-23883/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/ezpublish54_EZP-23883/vendor/symfony/symfony/src/Symfony/Component/HttpKernel/Kernel.php line 184

    at Symfony\Component\HttpKernel\Kernel->handle(object(Request))
        in /var/www/ezpublish54_EZP-23883/web/index.php line 77