Boot Camp: Verification failed, Disk Utility unable to repair disk

I am trying to install boot camp on my macbook, but when I tried I got a message that says:

Verification failed. This disk could not be partitioned. Use disk utility to repair disk.

But, when I go to Disk Utility, Repair Disk is greyed out. I have successfully verified and repaired disk permissions, but when I try to verify disk, I get a message that says:

First Aid Failed
Disk Utility stopped verifying “Macintosh HD” because the following error was encountered:
Filesystem verify or repair failed.

And in the history in red, it says"

Invalid volume file count
(It should be 582239 instead of 582240)
Invalid volume directory count
(It should be 148799 instead of 148798)
The volume Macintosh HD needs to be repaired
Error: Filesystem verify or repair failed

What should I try to do to get the disk repaired so I can install boot camp?