iMovie don’t see iPhoto from external hard drive El Capitan

I have an iMovie issue I just downloaded  El Capitan and now iMovie don’t see my photos on my external hard drive

I use to just pull my pictures from the external hard drive to the iMovie  but now I can’t and the photos library in iMovie only show a couple pictures

what do I have to do so I can pull my pictures from the iPhoto external hard drive to iMovie?

Thank you