[gmx-users] right hand side error

[Albert]

Hello:

I am running command line:

  gmx_mpi grompp -f step7_production.mdp -c step6.6_equilibration.gro -n 
index.ndx -p topol.top -o md.tpr

in Gromacs-5.1.2. but it always failed with messages:



ERROR 1 [file step7_production.mdp, line 42]:
   Right hand side '5.0  5.0' for parameter 'tau_p' in parameter file is not
   a real value


here are my settings:

cutoff-scheme           = Verlet
nstlist                 = 40
rlist                   = 1.2
coulombtype             = pme
rcoulomb                = 1.2
vdwtype                 = Cut-off
vdw-modifier            = Force-switch
rvdw_switch             = 1.0
rvdw                    = 1.2
;
tcoupl                  = Nose-Hoover
tc_grps                 = PROT   MEMB   SOL_ION
tau_t                   = 1.6    1.6    1.6
ref_t                   = 310 310 310
;
pcoupl                  = Parrinello-Rahman
pcoupltype              = semiisotropic
tau_p                   = 5.0   5.0
compressibility         = 4.5e-5  4.5e-5
ref_p                   = 1.0     1.0
;
constraints             = h-bonds
constraint_algorithm    = LINCS
continuation            = yes
;


I don't know what's the problem....

Thank you very much