Core Apps Not Launching After Installing OS X Mavericks I Installed OS X Mavericks about a week ago, It worked fine at first but all of a sudden no core Apps will load.

Mail, iCal, App Store, Maps, iMessage all quit and log a console message "Exited with Code 1" 

I have tried: rebooting, resetting the NVRAM, and booting my OS in safe mode. None fix the problem.

I really don't know how to fix this without doing a clean install and wonder if anyone has a solution to this more narrow than reinstalling the OS cleanly?
I managed to fix the issue by reinstalling OS X Mavericks

Here's how to fix it


Restart your machine
On boot hold Command and R
Choose to Reinstall OS X


System will restart as usual after install and OS X will be fully functional

You will NOT lose any settings or personal data with this method

:)