It looks like you are trying to import from Aperture/Iphoto.
Please refer the links below for complete Process
Let us know if that helps
The plugin only works with iPhoto. If you are using the new Photos for OSX you will need to export versions to the desktop and then import those copies into Lightroom. If you include IPTC metadata when exporting any keywords, captions or title etc. should show up in Lightroom.