"Can't find dummy mass for type CT bonded to type C8 in the virtual site database (.vsd files)"

GROMACS version: 2021.2-MODIFIED
GROMACS modification: Yes
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Hi, I’m trying to perform all atomic simulation following the article below.
ht tps://pubs.acs.org/doi/10.1021/acs.jpcb.0c06288?goto=supporting-info

I use a99SBdisp force field.

Then I got this error message.

Program: gmx pdb2gmx, version 2021.2-MODIFIED
Source file: src/gromacs/gmxpreprocess/gen_vsite.cpp (line 1990)
Fatal error:
Can’t find dummy mass for type CT bonded to type C8 in the virtual site
database (.vsd files). Add it to the database!
For more information and tips for troubleshooting, please check the GROMACS
website at Errors - Gromacs

I can’t understand “type C8” in this error message.
It seems to me that all information is already provided in aminoacids.vsd.

I don’t see what I should do at all.
Or should I ask a maintainer of the force field to add some parameters to aminoacids.vmd?