[gmx-users] Error of moleculetype

[s lal badshah]

Dear gromacs users,
Hi, 
I have encounter the following error,after addition of Sodium ions to my system as it has -5.00000 charge and before minimization.
Fatal error:
No such moleculetype Na
I have checked errors of gromacs but I didn't understand that.Is I will write the word NA below the [moleculetype ] in topology file ? or some thing other work.
Hoping for a favorable reply.
Regards,





SYED LAL BADSHAH 
M.Phil Scholar 
NCE in Physical Chemistry, 
University of Peshawar. 
NWFP,Pakistan. 
Cell # 03349060632.
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