<Unresolved reference: UnityPlayer> I need to add ...

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Unresolved reference: UnityPlayer
I need to add the UnitPlayer class, but my project never recognizes it. Where could the issue be?
This is a Kotlin project, and I've embedded a Unity game into it. I need to run the game within the mobile project and add extra buttons over the game's display, sending various commands to the game using these buttons. I'm using Kotlin Android for the first time, and I've tried all the solutions I could find, but none of them worked. Why can't I import this class?
All solutions are welcome!
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