Dear All , 

I am getting following error while trying the energy minimization  by using
following command 

gromacs-4.5.5/proj1% grompp -v -f minim.mdp -c protein-solvated.pdb -p
protein.top -o protein-EM-solvated.tpr

*ERROR 1 [file protein.top, line 6486]:*
  ERROR: One of the box lengths is smaller than twice the cut-off length.
Increase the box size or decrease rlist.

*
mdp file information *

; Lines starting with ';' ARE COMMENTS
; Everything following ';' is also comment

title           = Energy Minimization   ; Title of run

; The following line tell the program the standard locations where to find
certain files
cpp             = /lib/cpp      ; Preprocessor

; Define can be used to control processes
define          = -DFLEXIBLE

; Parameters describing what to do, when to stop and what to save
integrator      = steep         ; Algorithm (steep = steepest descent 
minimization)
emtol           = 1.0           ; Stop minimization when the maximum force < 
1.0 kJ/mol
nsteps          = 500           ; Maximum number of (minimization) steps to 
perform
nstenergy       = 1             ; Write energies to disk every nstenergy steps
energygrps      = System        ; Which energy group(s) to write to disk

; Parameters describing how to find the neighbors of each atom and how to
calculate the interactions
ns_type         = simple        ; Method to determine neighbor list (simple, 
grid)
coulombtype     = cut-off       ; Treatment of long range electrostatic 
interactions
rcoulomb        = 1.0           ; long range electrostatic cut-off
rvdw            = 1.0           ; long range Van der Waals cut-off
constraints     = none          ; Bond types to replace by constraints
pbc             = xyz           ; Periodic Boundary Conditions (yes/no)

please suggest needful 

Thanking you 



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