Instead, they're getting an error message that says the app is 'damaged and can't be opened'. Some users are complaining that they can no longer open certain apps after updating to macOS Sierra. macOS Sierra problems: apps show 'damaged and can't be opened' error Running the Repair Disk tool from within Disk Utility may also help, and for more solutions check out our How to speed up your Mac guide.

Now repeat the process with /Library/Caches (without the symbol). Remove the data from inside every folder.

In the text box that appears type /Library/Caches

Open the Finder window, select 'Go' from the top menu and select 'Go to Folder'. To force-quit an item, click it in the Activity Monitor list, then click the X at the left of the toolbar, then confirm you want to force-quit.Īlso delete the cache.