Hi,
I would run fsck in single user mode, once in single user mode follow the directions on screen.
To start up in single-user mode:
1) Choose Apple menu > Restart, or press the power button if the computer is turned off.
2) Press Command-S as the computer starts up.
The computer screen is black with standard white text.
Type the following command into the terminal and press Enter to start a file system check:
/sbin/fsck -fy
This will start the disk checking, once it is done you will see one of two messages.
1) The volume [name] appears to be OK” if everything is fine.
2) If it found problems, you’ll see a * FILE SYSTEM WAS MODIFIED * message.
This indicates fsck found and fixed problems. The fsck command may find additional errors after repairing the first batch of errors, so Apple recommends you run the fsck command again if it found and fixed problems.
Personally I would run the above fsck command until you see a “** The volume [name] appears to be OK” message.
If the fsck command says your disk is okay, type the following command at the terminal and press Enter:
reboot
Your Mac will reboot, returning you to the usual login screen.
There are only three ways I know of to fix this invalid leaf record count problem
1- Run FSCK - may fix
2- DiskWarrior - may be able to fix
3- Reformat the drive.
Please post back with results.