private function UpdateBundleVersions()
    {
        $this->ClearInstalledBundles();
        $bundles = PathUtil::Bundles();
        foreach ($bundles as $bundle)
        {
            if (!array_key_exists($bundle, $this->failedBundles))
            {
                $this->UpdateBundleVersion($bundle);
            }    
        }
    }