[gmx-users] Using x2top and grompp

[Devon Dillon]

> 
>> My goal is to get a topology.tpr and trajectory.xtc in those file formats. I’m starting off with .pdb, .xyz, and .gro files of an experimentally determined crystal structure. The crystal contains two kinds of molecules that interact via halogen bonding. i do not want to run these molecules in a solvent. when ever i submit a job to x2top i get a fatal error stating it could not find a forcefield for all of the atoms and terminates. when using pdb2gmx i get an input/output error then it states the (name of the file .pdb.gro). I have tried to selecting all of the different force fields what can i do to fix my problem?
>> Thank you