Is the iPhoto library missing from your Mac computer ? If that is happened then the picture stored in the library will also not be visible in the application. So you also not be able to perform any operations on it. The stored photos must have been very important for you and you don't want to lose it. This situation can occur due to some internal error and or if the library has gone corrupted by some external agents like virus programs etc. The iPhoto library missing issue can be dealt by just creating a new library and the save the copy of the photos from any other back up source. If the backup is not available to you then you can use the iPhoto recovery software to scan the Mac drive for the lost photos. The software will bring out photos of every format in the preview. You need to choose the required photos to restore them. You will not encounter any corruption issue in the recovered photos. So download and use the software and you can easily deal with the iPhoto library missing problem.