You don't say what you were doing when you received the error, but the error message seems pretty self explanatory - you are trying to copy D:\Gsak\LoclMaps.zip to D:\Gsak\LoclMaps.zip - i.e. you have the same path and file name in the copy from and the copy to.
Perhaps if you tell us what context the error occurred in, we could give you a more specific recommendation.
Perhaps if you tell us what context the error occurred in, we could give you a more specific recommendation.