You can check the following to see if it causes the problem.
1. Check iTunes version to see if it is 18.104.22.168 or later.
2. Check iTunes to see if it runs normally.
3. Check iTunes to see if Share iTunes Library XML with other applications in iTunes Preferences>Advanced is checked.
If it still does not work, re-start several times and send us the log files to email@example.com with problem details. You can find log files here:
For Windows version: Please keep Win+R on the keyboard pressed or click Start>Run, input %appdata%/Leawo\TunesCopy\Log, click the OK button.
For Mac version: Please keep Win+shift+G on the keyboard pressed, then find ~/Library/Application Support/com.leawo.tunescopy/Log/run.log.