[gmx-users] Non-bonded Copper

[Matthew Roode]

Greetings all,

Let me preface this by stating I'm new at MD simulation.  I am trying  
to perform a simulation which involves non-bonded copper atoms,  
amongst other things.  I'm making use of the Lennard-Jones potential  
to describe the non-bonded interactions between them, and I've input  
the parameters in the ff*nb.itp file after ensuring Cu was defined in  
the ffgmx.atp file.  I use x2top to generate the topology file, but  
the program stops on a fatal error telling me "No forcefield type for  
atom Cu (841) with 0 bonds".  Can any of you out there offer any  
advice on the cause of said error?  Thus far my troubleshooting has  
failed.

Thanks in advance for your assistance.

Matt