Problem:
Running Disk Utility from the recovery partition, Repair Disk, yields the following error message:
"Error: Live file system repair is not supported.”
Running Verify Disk yields the following error message:
“Error:  The partition map needs to be repaired because there’s a problem with the EFI system partition’s file system.”
Solution:
Just use internet recovery:
Reboot system > hold down the keys COMMAND + ALT (or option) + R

Tags: Mavericks, Repair Disk