1. Add AcmeDemoBundle to routing.yml

# app/config/routing.yml
AcmeDemoBundle:
    resource: "@AcmeDemoBundle/Resources/config/routing.yml"
    prefix:   /

2. Remove from production env and place in production

<?php

use SymfonyComponentHttpKernelKernel;
use SymfonyComponentConfigLoaderLoaderInterface;

class AppKernel extends Kernel
{
    public function registerBundles()
    {
        $bundles = array(
            new SymfonyBundleFrameworkBundleFrameworkBundle(),
            new SymfonyBundleSecurityBundleSecurityBundle(),
            new SymfonyBundleTwigBundleTwigBundle(),
            new SymfonyBundleMonologBundleMonologBundle(),
            new SymfonyBundleSwiftmailerBundleSwiftmailerBundle(),
            new SymfonyBundleAsseticBundleAsseticBundle(),
            new DoctrineBundleDoctrineBundleDoctrineBundle(),
            new SensioBundleFrameworkExtraBundleSensioFrameworkExtraBundle(),
            new AcmeDemoBundleAcmeDemoBundle() //add this line,

        );

        if (in_array($this->getEnvironment(), array('dev', 'test'))) {
            //$bundles[] = new AcmeDemoBundleAcmeDemoBundle(); -- remove this line
            $bundles[] = new SymfonyBundleWebProfilerBundleWebProfilerBundle();
            $bundles[] = new SensioBundleDistributionBundleSensioDistributionBundle();
            $bundles[] = new SensioBundleGeneratorBundleSensioGeneratorBundle();
        }

        return $bundles;
    }

    public function registerContainerConfiguration(LoaderInterface $loader)
    {
        $loader->load(__DIR__.'/config/config_'.$this->getEnvironment().'.yml');
    }
}

Let me know if it works!