'Error in using VideoSurface script of Agora Video SDK in Unity

I am currently implementing Video call using Agora in Unity. I am facing an error which shows "error CS1061: 'VideoSurface' does not contain a definition for 'mAdjustTransform' and no accessible extension method 'mAdjustTransform' accepting a first argument of type 'VideoSurface' could be found (are you missing a using directive or an assembly reference?)"

Please help me.....:(



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