Hello everyone, 

I was using pcff in material studio, I see material studio uses some automatic parameters for below atom type while doing geometry optimization in material studio.

Energy contributors using automatic parameters: 

Bond Stretch : (c2 nb)

while converting to lammps data file, I find 

Get force field parameters for this system
Trying Atom Equivalences if needed
Unable to find bond data for c2 nb

...

so on, 

How can I update these parameters?