Hi Akash Sharma,
I did as advised and purged the cache. Unfortunately I am still getting the same error message. It seems that it only does this when I am trying to open Photoshop PDF file that has layers of color involved in the artwork. Interesting. Any more thoughts?
Is that unique to one file only?
It does it on several files. Basically they are files of scanned artwork/sketches, which I then manipulate with channels and drop in a new layer of color. Usually I've been saving them as .pdf files, which is when they have trouble reopening. When I save them as .psd files, they reopen just fine.