Mp3 Playback not supported on my Moto g

Hello, I rooted my Moto G lte 2013, I installed Cyanogenmode 13 and the Gapps. Everything is ok, but I have an issue with wordreference app, when I try to listen to the pronunciation of a word, a popup appears saying:
"Mp3 playback is not supported. Linux users can install Gstreamer to get support."

How can I fix it?
Ps. This audio issue occurs only when I use the app, it works on the website.

Thank You

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