Avast mobile App Firewall Problems

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http://androidforums.com – Hi, I have a galaxy S4 running android 4.2, i downloaded avast mobile protection app (the free version) to try it, all features work perfectly except the firewall, when i tap on firewall the enable fire wall is not Ticked and when i try to enable it it shows me a message telling me:"Could not acquire root access. You need a rooted phone to run the avast firewall. If this phone is already rooted, please make sure the avast firewall has enough permissions to execute the SU command.", please tell me how to fix this problem because the firewall has essential features for me. Regar (General)