Moreover, it mostly appears after a reboot, logging-in, and is seldom followed by a complete system crash. Contrary to the popular belief, the error message is not related to privacy invasion. Here are step-by-step instructions to get rid of the error once and for all:
Booting into Safe Mode Fix
Once of the simplest methods to fix the error code is to boot into Safe Mode followed by a normal system reboot. Safe Mode basically clears out the system level cache – including Unapproved Caller error.
Booting into Safe Mode
To boot into Safe Mode on any Mac device, hold down the ‘Shift’ key after you hear the initial bootup sound. To be on the safe side, keep on holding the ‘Shift’ key until you see the Login Screen or Desktop.
Dumping Cache and Normal Reboot
Once your Mac device is in Safe Mode, it should automatically dump cache. Once you have successfully launched into Safe Mode, click the Apple Menu and select Restart for a normal reboot. If everything goes smoothly, you should never see Unapproved Caller error again.