Exporting a game using MAC computers

Hi

I’m trying to convert a designed game in blender using the File, export as, Save as game engine runtime but it keeps displaying the error message (see screenshot)

I’ve made sure the check boxes are ticked in user preferences ‘Game engine publishing’ and ‘Save As game Engine Runtime’

I’ve been fine exporting games in Windows but this is being done with an Apple Mac. Is there a different procedure when exporting game files?

Thanks

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