This error terminates the synchronization so that your files can’t be synced successfully.
iTunes has recently started to report me an error when I connect my iPhone to Mac.
It says cannot save my library on iTunes.

What does it mean?
How can I fix it?
Thanking in advance for your help.

The issue keeps happening.
Another thing I have noticed is that my right clicking solution keeps being undone when I reboot my computer.
Has anyone had this issue and tried something other than what I listed above to fix it?

I have Windows 10 and IOS 9.2.
However, the sync process may be ceased by the iTunes sync error 54.
If the PDF files are not useful anymore, kindly delete them directly.
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