Issues with Vuforia Unity after building it into xCode

Hello, After I make a xCode build using Unity, there's these following errors appear in the xCode console when I was trying to make a build for iOS: Undefined symbols for architecture armv7: "_UnityRenderBufferMTLTexture", reference from: PlatformiOS::setRenderBuffers(*void) in libVuforiaUnityPlayer.a(PlatformiOS.o) "_UnityCurrentMTLCommandEncoder", reference from: PlatformiOS::setRenderBuffers(*void) in libVuforiaUnityPlayer.a(PlatformiOS.o) Also, we did not make purchase to Vuforia. This Unity project was handed over to us with all the Vuforia plugins in it. If we have to make purchases, do we have a way to know what license is the current plugin under? The Vuforia section in the TDD of this project only write this... "1.9. Vuforia <Image of Vuforia logo> https://www.vuforia.com/ The Vuforia AR Extension for Unity enables vision detection and tracking functionality within the Unity IDE and allows developers to create AR applications and games easily. Developers need first to obtain Unity Android and/or Unity iOS from Unity Technologies to use the Vuforia AR Extension. The Vuforia AR Extension is compatible with both Unity Standard and Unity Pro. License: https://developer.vuforia.com/legal/license/2-6"