Fatal error: Residue 175 named GLU of a molecule in the input file was mapped to an entry in the top

GROMACS version: 2020.1-Ubuntu-2020.1-1
GROMACS modification: Yes/No
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Program: gmx pdb2gmx, version 2020.1-Ubuntu-2020.1-1
Source file: src/gromacs/gmxpreprocess/pgutil.cpp (line 130)

Fatal error:
Residue 175 named GLU of a molecule in the input file was mapped
to an entry in the topology database, but the atom CG used in
that entry is not found in the input file. Perhaps your atom
and/or residue naming needs to be fixed.

For more information and tips for troubleshooting, please check the GROMACS
website at Common Errors — GROMACS webpage https://www.gromacs.org documentation