When trying to move my photos library over to an external I got an error message that said finder can't complete he operation because some date "photos" library can't read or written. Error code 36. When i back up using time machine i don't get an error messages. I've been trying to clear some space so that's why i trying to move it to a new external. Two questions, is there anything i can do fix this? If i decided to buy a iMac, would I run into this same error when i move everything from my old machine to my new machine?