[gmx-users] No default Angle types

[Darrell Koskinen]

Dear GROMACS Gurus,
I received the following error when running grompp:
/
ERROR 0 [file "graphene.top", line 392284]:
  No default Angle types
/
I believe this error is referring to the fact that there was no 
definition of an angle type for the following combination of atoms:
HA CA CT
since line 392284 of the top file has this combination of atoms.

I took a look through the ffoplsaabon.itp file and saw that indeed there 
was no definition for an angle between this combination of atoms. So I 
thought that I could resolve this error by copying the ffoplsaabon.itp 
file into my working directory, making a copy of the line for the CA CA 
HA and renaming the combination CT CA HA. However, when I ran grompp 
again, I still get the same error. Please advise.

Thanks.

Darrell