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I think that is not actually an error message. It just says Vuforia cannot be started before it is initialised. That is more like an information....
You need to enable delayed initialisation first. Then use the above singleton. To start the ar scene, use the code in my first post.
Improving on the above, I made a singleton to manage these. This will listen to scene changes and disables Vuforia accordingly. using...
TLDR: Call VuforiaBehaviour.Instance.enabled = false; before calling VuforiaRuntime.Instance.Deinit(); I had the same problem and somehow I fixed...