How to fix the “another sync client is already running” iTunes error. (iPad & iPhone) » Untick the content type causing the problem, listed in a warnings window.

Untick the content type causing the problem, listed in a warnings window.

Untick the content type causing the problem.

Any problems that occur during sync will be shown in a warnings window, untick options for that type. In my case movie files caused an issue, therefore I ensured that Automatically include all movies was blank, and all movies unticked/un-checkmarked.

Connect device, Reset Warnings, then Apply.
Click Apply once more.

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