Error : disk needs to be repaired | macBook Pro 15"

Hello everybody,
when I try to verify my HD from the Disk Utility, it tells I have a problem and I get this message " this disk needs to be repaired using the recovery hd restart your computer..... " as shown in the photo below.
after restarting the computer and choosing Disk Utility, I first choosed to Verify and Repair the "Virtual Whole Disk"  it worked well for both and the result was OK and the "Disk Status is : Online"
But the problem is I can't repaire the "OS X Base System", I can only verify. The button "Repaire Disk" is greyed out
Can someone help me solving this problem?
Thanks

Pretty difficult to tell. I'm guessing a serious mess-up in the directory structure and/or partition map. But that's just guesswork.
Can you still successfully boot from the Recovery HD? If so, then you can do the following:
Install or Reinstall OS X from Scratch
Be sure you backup your files to an external drive or second internal drive because the following procedure will remove everything from the hard drive.
Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
Erase the hard drive:
  1. Select Disk Utility from the main menu and click on the Continue button.
  2. After DU loads select your startup volume (usually Macintosh HD) from the
      left side list. Click on the Erase tab in the DU main window.
  3. Set the format type to Mac OS Extended (Journaled.) Optionally, click on
      the Security button and set the Zero Data option to one-pass. Click on
      the Erase button and wait until the process has completed.
  4. Quit DU and return to the main menu.
Reinstall OS X: Select Reinstall OS X and click on the Install button.
Note: You will need an active Internet connection. I suggest using Ethernet if possible
           because it is three times faster than wireless.
This should install the version of OS X that you had installed.

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