6. Now open the iTunes Music Library .xml using TextEdit on the secondary Mac. Replace the library permanent ID with the library you copied from the first computer in step 4. Then save the file.
7. Open iTunes Library with TextEdit .itl on the auxiliary file. Delete all contents of the file, then save the file. Now open iTunes to check if the error still exists.
Note: If an error message appears, click "OK" to leave it alone. The "iTunes Library.itl" file does not appear to be a valid iTunes library file. Furthermore, for Windows users, this method is also applied. Go to C:\Users\USERNAME\MUSIC\iTunes and follow the same steps listed above. Another way to fix iPhone syncing with another iTunes library error: Although iTunes is officially produced by Apple, unlike iPhone, iPad, and Mac, iTunes is known for its instability It received a lot of complaints about performance, crashes, bugs, and poor readability. Generally speaking, I don't recommend users to copy files via iTunes accidentally. Here Tenorshare iCareFone is highly recommended - it allows users to sync music, notes, contacts, videos, etc. between iDevice and Windows/Mac with just one click.
1. Download and install the program on your computer. Connect the device to the computer via USB cable.
2. Run the program and click "File Manager" from the interface. Then select the menu you want to manage.
I’ll use contacts as an example here. You can import and export files from/to your computer. At the same time, you can manually edit each item.