"The actor is so big that it creates a pre-shadow and there would be a loss of performance"(Be cast shadow has set to false)"

Development Asset Creation
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This issue is caused when using movable meshes that are very large causing the entire scene to have to be re-rendered into the preshadow depth map. I don’t believe that there is a way to disable the error.

Your best bet is to break your mesh up into smaller pieces or reduce the size of the mesh itstelf.

See the following for more info: