pod executable not found: /usr/bin/pod GPLAYGames Plugin error - pod Heelp

Hi guys,
Im building a game for Android and iOS, with GooglePlayGames plugin, and using UnityAds, all on both Platforms.

I get this error only at build stage in Unity when building for iOS using GooglePlayGames plugin for Unity:
pod executable not found: /usr/bin/pod

(My android build is fine)

After lots of sifting, i think I now know that the 'pod', a cocoapod (which I know much nowt about as not used them at all ) is supposed to reference and create some GPGS framework elements for...

pod executable not found: /usr/bin/pod GPLAYGames Plugin error - pod Heelp