I try to add a basic > sphere but says none

Hey,
I have been using ue4 on and off and have not come across this. It seems like the mesh or actor is completely gone, how do i restore it? or be able to import it or what i need to do. Im not all sure what I did.
Thanks

That looks like somehow you’ve managed to delete the sphere mesh from the engine content. It might be a good idea to verify the engine. In the launcher:

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