Error in compile VASP with VASP_MPMD

[sungeng]

Hi
I am trying to use the AKMC code in eon, I read the instructions online
and I want to using a mpi potential with vasp.

So I compile the vasp with -DVASP_MPMD , but I got an error :

chain.f90(597): error #6460: This is not a field name that is defined in the encompassing structure. [MPMD_CLIENT_RANK]
mpmd_client_rank = comm_chain%mpmd_client_rank

How could I fix this error ? thank you !