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You probably need to insure that you have write permission on the destination folder (or disk).
Are you keeping your images on an external drive formatted with NTSF? If so, you need a "third-party" service app to allow your Mac to write to it, and El Capitan broke that app. You'll need to get a copy that works with your new operating system.
Thank you for your answer Hal. yes i keep my images on an external drive. But I don't know if it is formatted with NTFS. How can i verify this information? And What does it mean "to get a copy that works with your new operating system"?
I mean what kin of copy?