iPhoto can't find photos upon opening
I recently downloaded the latest version of iPhoto '09. It has been working fine until I decided to clear out a few old photos from Finder on my Mac. Now, whenever I open iPhoto, a message pops up saying "ALERT- The photo '......' could not be opened, because the original item could not be found" This is really annoying, as I have the option of cancelling or finding the photo. If I press cancel, it another window pops up for another photo. It keeps going on like this for ages, and when I finally reach the end, eveything is normal. I thought it was all clear the first time I did it, but every time I open iPhoto this happens. I can't quit iPhoto or completely cancel the operation or anything. I need to go back to using iPhoto, but I can't at the moment. Please help!!!
Mac OS X (10.7.3), MacBook Pro 13"