Neb method

i have tried many no of configurations but my results are not converging for NEB command. formard barrier decreases for some time but then again increases. can any one tell me why ?
i have attached my input as well as log file . (2.88 KB)

log.lammps.0 (10.7 KB)

log.lammps (20 KB)

Steve had recommended you to try a newer LAMMPS version, yet you are still using a 3 year old LAMMPS version.