Iphoto is crashing on startup
Could someone please give me some prompt advice? After spending hours at the week-end sorting images in iPhoto into specific folders for a Christmas photo project I am working on, iPhoto is now crashing on start-up. This has never happened before. I also have a Macbook Pro which I recently upgraded from Lion to El Capitan, with a view to practising with it before upgrading my iMac (running Mountain Lion 10.8.5) to El Capitan. I intended to export the newly created folders in iPhoto to my laptop using USB. So, my question is this……Should I ignore the iPhoto glitch and upgrade to El Capitan now or should I try to fix the problem before upgrading? I have backed up to Time Capsule. All photos are visible in that external drive and also, momentarily, when iPhoto launches but, blink and it crashes. Many thanks to anyone who can help me access my photos and complete my project.
iMac (21.5-inch, Late 2013), OS X Mountain Lion (10.8.5)