Terminating with uncaught exception of type Il2CppExceptionWrapper when using Arkit

This is my scenario :
I have imported Unity Arkit plugin from asset store. Now I am trying to load a new empty scene from FaceBlendshapeSloth scene. And getting the error below :

libc++abi.dylib: terminating with uncaught exception of type Il2CppExceptionWrapper

I have tried both these methods

  SceneManager.LoadScene(1);
  //AsyncOperation ao;
  //ao=SceneManager.LoadSceneAsync(1);

I have added all required scenes in build setting.

you have anchorPrefab in your FaceAnchormanager, add null checks like below in FaceAdded, FaceUpdated, FaceRemoved :

void FaceAdded (ARFaceAnchor anchorData)
{
if (anchorPrefab == null)
return;

…code

}

do like this for other function mentioned above, also unregister these delegates registered in OnDestroy.

See if that helps!