[gmx-users] Atom type SDMSO not found

[su]

Hello everyone
I am doing protein-ligand simulation according to Justin's tutorial. After running gmx grompp command, i encountered following error: 
Fatal error: 
Atomtype SDMSO not found.
Is this the force field matching problem? because i am not able to find out any such atom types in any of the generated files. 
Please guide me where the problem is. All other commands ran properly. 

Suniba
Sent from my iPhone