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Looking at the WebClient docs, the method is described as: Downloads a string from a resource, without blocking the calling thread. and given the error message: INTERNAL_CALL_Internal_InstantiateSingle can only be called from the main thread It's clear that you need to download the data and store it, and only call DisplayCells, in the main ...


I think this is happening because you are trying to Instantiate() in a class that does not derive from MonoBehaviour. Ensure that the class you use to "Instantiate" gameobjects, derive from the MonoBehaviour base class, otherwise, you will be getting this error.

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