[gmx-users] OPLS force field issue....

[Sidath Wijesinghe]

Dear Friends,

i have done a MD simulation using OPLS/AA in lammps which contains 7930
atoms.
i want to run this in Gromacs

so i followed this step

 g_x2top -f test.pdb -o np1.top -name np1 -ff oplsaa -pbc ( test.pdb is the
pdb i obtained from my simulation)
 after that it was trying to find the parameters from
oplsaa.ff/atomname2type.n2t
There are 23 name to type translations in file oplsaa.ff
Generating bonds from distances...

and i got an error as following

Fatal error:
Could only find a forcefield type for 7100 out of 7930 atoms
For more information and tips for troubleshooting, please check the GROMACS

i have no idea what and where i need to work on to solve this problem.
please be kind enough to help me out with this

-- 
Sidath Wijesinghe
Graduate Teaching Assistant
Dept Of Chemistry
Clemson University