No default U-B error with charmm36 force field

GROMACS version: 2019.4
GROMACS modification: Yes

Dear GROMACS users.
As I would like to use the charmm36 force field, I followed tutorial written by Justin. And there was another version of charmm36 force field that I used, named charmm36-mar2019.ff’.
However when I run genion step, there was errors that I have never met:
ERROR 1 [file lig.itp, line 437]:
No default U-B types

ERROR 2 [file lig.itp, line 451]:
  No default U-B types

ERROR 3 [file lig.itp, line 630]:
  No default Proper Dih. types

ERROR 4 [file lig.itp, line 633]:
  No default Proper Dih. types

ERROR 5 [file lig.itp, line 636]:
  No default Proper Dih. types

ERROR 6 [file lig.itp, line 639]:
  No default Proper Dih. types

ERROR 7 [file lig.itp, line 648]:
  No default Proper Dih. types

Is there any point what I’m missing or what I have to check???
How can I solve this problem?

Best regards,

The ligand requires new parameters that should be provided by a file called lig.prm if you used our conversion script. That file needs to be #included at the top of the topology.

please check related lines such as 451for bonded parameter and other lines for Proper Dih. types
then add force field parameter in topology file.

I’ve already added lines at the top of topology file( as below:

; Include ligand topology
#include "../LIGAND/lig.itp"

; Include ligand parameters
#include "../LIGAND/lig.prm"

Parameters required by the ligand have to be #included before the ligand topology. What you have now is a ligand topology that requires new parameters, and you’re only defining those parameters later. That won’t work.