You have to place both parts of the device into the schematic:   What happened when you clicked the "Check the packages" button (as in the image in your post)?

So when I clicked the "Check Packages" button, it brought up another dialog for pin assignments. They looked ok, but I could not edit them. However, I searched for the same part again and found a different version. I replaced the old one with this new one and it worked fine. I guess, I am having issues with parts that don't seem to work that are in the library. Maybe there needs to be some vetting of parts in the library, or else I don't know how to use the software. It seems frustrating at times when simple things don't seem to work as expected. Thanks...

Frpm my screenshots above, the alternative part you have chosen is almost certainly a user contributed part. Please check both the schematic symbol and the PCB package very carefully!

Sure, I realize that now....Thanks....

Hi That  is because of the LFCSP-16_4X4X05P doesn't have the Pad17, it fixed now, please try again, it should be working. Thanks