My iTunes crashed.
Error notice shows "An unknown error occurred (-38)."
I tried opening it with Opt. Cmnd unsuccessfully.
That is the extend of my knowledge with a MAC.
iMac 21.5", macOS 10.14
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Try these steps first: https://support.apple.com/en-us/HT205724.
You can also try https://support.apple.com/en-us/HT204063.
You can also try loading you Mac into safe mode, then restarting normally. See https://support.apple.com/en-us/HT201262 for more info.