The type or namespace name 'Hands' does not exist in the namespace

[thefirstfloor]

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Library\PackageCache\com.edia.core@fd431c6c2acc\Runtime\Base\Scripts\Experiment\XRManager.cs(4,22): error CS0234: The type or namespace name 'Hands' does not exist in the namespace 'UnityEngine.XR' (are you missing an assembly reference?)

[thefirstfloor]

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You are missing the Hands package, install via package manager.