Free energy

Dear Lammps users ,

I try to calculate the free energy of water with FEP method .
( free energy of one water molecule inside of a box of it ) .
Unfortunately I just get 0.0 amount for free energy !
Can you please let me know what might be problem ?

This is a part of my input file :

data.water (117 KB)

in.fep (3.38 KB)