Generating the input file

Hi all

I want to simulate an EDLC , I made the structure in Materials studio and exported the files as .car and .mdf files. Then by using msi2lmp I intend to generate a lammps datafile. But I am getting the following error message.

Get force field parameters for this system
Unable to find mass for xx

Is there any other method to model a capacitor with two fixed electrodes and ionic electrolyte in between? So that I can generate LAMMPS input file from that.