The simply way to solve this problem is easy, by reseting the PRAM. We can resetting PRAM using this step.
- Shut down your Mac.
- Locate the following keys on the keyboard: Command (⌘), Option, P, and R. You will need to hold these keys down simultaneously in step 4.
- Turn on the computer.
- Press and hold the Command-Option-P-R keys before the gray screen appears.
- Hold the keys down until the computer restarts and you hear the startup sound for the second time.
- Release the keys.
It must have occurred due to corrupted setup.Buy a fresh copy ans install the operating system to avoid this error.
ReplyDeleteThanks
Silvester Norman
Change MAC Address
Ok thanks for the advice, I have download the Installer from App Store before.
ReplyDeleteBut the problem solved by resetting PRAM