gromacs ,energy minimization step

Question

[yuti018]

gmx mdrun -deffnm nvt this command gives an following error Source code file: /home/dell-gib/softwares/gromacs-5.1.2/src/gromacs/mdlib/constr.cpp, line: 555

Fatal error:

step 0: Water molecule starting at atom 69515 can not be settled. Check for bad contacts and/or reduce the timestep if appropriate.

have tried editing minim.mdp file with multiple changes in value still no outcome was found...plz provide solution at earliest following changes were tried nstxout = 100 ; save coordinates every 1.0 ps nstvout = 100 ; save velocities every 1.0 ps nstenergy = 100 ; save energies every 1.0 ps nstlog = 100 ; update log file every 1.0 ps