[gmx-users] Problem using gromacs

[soumi]

Respected Sir,
              I am new user of gromacs. When I use the following command 
gmx grompp -f ions.mdp -c 1aki_solv.gro -p topol.top -o ions.tpr

I get the following error :Number of coordinates in coordinate file does not match topology file.
Please tell me how can I correct the number of coordinates in gromacs?

With regards,
SoumiDas