I almost had to guess, given the correctness of your configuration, that you just need to restart and restart apache:
sudo service apache2 reload sudo service apache2 restart
If not, I suppose why this did not go unanswered, there is not enough information about the basic information, for example, "/var/log/apache2/error.info" or additional explanations, as well as providing us with what you did earlier as a configuration .
I hope you processed it and did not give up!
= ^)
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