Hello sbahles,
Thanks for using the Apple Support Communities. We understand that you're running into an issue deleting an item from your Mac. There are a few basic actions you can try that may help.
Log out, sleep, wake, restart, or shut down your Mac
- Force close any open or idle applications
How to force an app to quit on your Mac
- Try to delete the item while booted up into safe mode
How to use safe mode on your Mac
Keep us posted on how it goes, and if additional help is needed, we'll be happy to continue working with you towards finding a solution.
Best regards.