Safari
Safari cannot be opened while it is being updated? What to do?
iPod shuffle (4th Gen)
Question marked as
Go step by step and test.
1. Restart your Mac.
2. Quit Spotlight from Activity Monitor
Finder > Applications > Utilities >Activity Monitor
CPU > All Processes > Spotlight
Select Spotlight and click the Stop button at top left most corner of the window.
Quit Activity Monitor and test.
https://support.apple.com/en-us/HT201464
3. Reinstall macOS from macOS Recovery. https://support.apple.com/en-us/HT204904