Iphoto rebuilding thumbnail alert

Question

Since I had missing photos, I started rebuilding but in the middle of rebuilding an alert appears. (ALERT) The photo “IMG_***.JPG” could not be opened, because the original item cannot be found. I either have a choice of canceling or find the photo. Is there another way of doing this? PLEASE HELP!!!!!!

Answer 1

Has the rebuiliding completed?  If it hasn't finished by now then I think you should force quit out of iPhoto and try the following:
Starting over from scratch with new library
Start over with a new library and import the Originals (iPhoto 09 and earlier) or the Masters (iPhoto 11) folder from your original library as follows:
1. Open the library package like this.
2. Launch iPhoto with the Option key held down and, when asked, select the option to create a new library.
3. Drag the subfolders of the Originals (iPhoto 09 and earlier) or the Masters (iPhoto 11) folder from the open iPhoto Library package into the open iPhoto window a few at a time.
This will create a new library with the same Events (but not necessarily the same Event names) as the original library but will not keep the metadata, albums, books slideshows and other projects.
Note:  your current library will be left untouched for further attempts at a fix if so desired.