Please note this is an old forum thread. Information in this post may be out-to-date and/or erroneous.
Every phpdocx version includes new features and improvements. Previously unsupported features may have been added to newer releases, or past issues may have been corrected.
You need to use the namespaces package, not the package without namespaces. You can download it from your account.
And about 'Runtime Notice'; it's not an error but a notice. You can avoid that messages in the Symfony config or PHP env.