iPhone 7 won't back up to iTunes
I got a new iPhone X yesterday and I'm trying to back up my old iPhone 7 to iTunes to then get my new iPhone going. I keep getting the message "iTunes could not back up the iPhone "laCole's iPhone" because an error occurred while reading from or writing to the iPhone". I have all programs up to date on both my mac and my iPhone 7, turned both off/on. My last back up was 2/2019 and it is on my Mac. Any help on how to make this work?
iPhone 7, iOS 12