Here are some of the easy methods and steps that you need to follow to Fix Bluetooth Not Available Error in MacBook. You could get the Bluetooth error when you try to visit Bluetooth menu on your Mac, especially after you update to a new OS X.
Are you having trouble getting Bluetooth to connect?
Follow following steps below
1- Open Finder (furthest icon to the left in your Mac’s Dock)
2- While holding Alt (Option), click Go in the menu bar (A). …
3- Select Library from the list (B)….