Could you please post a screenshot of your Lightroom Import window?
and make sure that the "TO" location on top right is set correctly as the location which has enough permissions to store images.
That message usually means that the files could not be written because you do not have permission to write to the folder that you are trying to copy the images to. Change permissions on the receiving location and you should be OK.
How would I do that? I'm a newer Mac user and I'm still figuring a lot out.
The location to copy the images is set to "Macintosh HD" on top right which is not the correct location.
Try changing it to Pictures and that should fix the issue