I need to access some of the pictures I was editing in Lightroom. I'm not sure what happened. I needed more space on my computer, so I deleted files that were not in Lightroom. (They were also still in my IPhoto) Now, I have the (! ) since I can still see the picture, why can't I use it? I have read that if it's not still on my computer, Lightroom can't access it. I get that, but why can I not access it in IPhoto, it also shows up there, but when I try to take it out of IPhoto it also says it's missing. This is so frustrating!
Try exporting from iPhoto.
File >> Export
Under the File Export tab click the drop-down list for Kind and choose Original.
Save the copy and put it back in the folder which Lightroom points to.