Hi, I recently upgraded my AR Foundation package from 1.0 to 1.5 and I successfully migrated my project. Everything is still building and running fine on Android, but I am getting build errors when trying to build to iOS: Undefined symbol: _OBJ_CLASS_$_ARCollaborationData Undefined symbol: _OBJ_CLASS_$_ARSkeletonDefinition Undefined symbol: _OBJ_CLASS_$_ARBodyAnchor Undefined symbol: _OBJ_CLASS_$_ARBodyTrackingConfiguration Undefined symbol: _OBJ_CLASS_$_ARMatteGenerator Undefined symbol: __isPlatformVersionAtLeast Xcode version: 10.2.1 Unity version: 2018.4.2f1 AR Foundation package version: 1.5.0-preview.5 ARCore XR Plugin version: 2.1.0-preview.5 ARKit XR Plugin version: 2.2.0-preview.1 Am I missing something here? ------------------------------------------------------------------------------------------------------------------------------ EDIT: I fixed it. The problem was that I was using ARKit XR Plugin version 2.2.0 while I should have been using 2.1.0. For anyone else having these kind of problems: https://github.com/Unity-Technologies/arfoundation-samples#warning-arkit-3-support