I too am having this issue. I created a document with several layers in photoshop and saved it as a pdf. When I tried to open it, I got the message that because of a program error, photoshop could not complete the request. I had to create the document all over. This time I made sure I saved several psd versions before saving the pdf. Again, photoshop would not open the pdf, but would the psd. The pdf will open in other programs, but not with layers. I hope some from Adobe can address this. I am running CC 2018 on a MacBook.
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