For the last month or so, every time I try to sync my iPhone XR to iTunes (on a Mac) I get an error:

The iPhone "Ruby" cannot be synced. THere are too many files open currently.

This started happening when I tried turning on Wi-Fi sync between my phone and my Mac. I have since turned it off, but the error persists. I have rebooted my Mac and my iPhone multiple times since then to no avail.

Other devices (an iPod Touch, two different iPads) synchronize just fine to the same computer, and my photos are able to transfer from this iPhone to Photos as well.

Any idea what's going on and how I can fix it?

There are several threads about this on the Apple discussion forum, but all of them have gone unanswered for many years.

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