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since completing my .gro i also added to the ffbonded.itp based on the gsh.prm and itp data.
I have run into errors /w trying to add ion’s with grompp

ERROR 1 [file topol.top, line 36837]:
  No default U-B types


ERROR 2 [file topol.top, line 36838]:
  No default U-B types


ERROR 3 [file topol.top, line 51480]:
  No default Proper Dih. types


ERROR 4 [file topol.top, line 51481]:
  No default Proper Dih. types


ERROR 5 [file topol.top, line 51482]:
  No default Proper Dih. types


ERROR 6 [file topol.top, line 51483]:
  No default Proper Dih. types


ERROR 7 [file topol.top, line 51484]:
  No default Proper Dih. types


ERROR 8 [file topol.top, line 51485]:
  No default Proper Dih. types


ERROR 9 [file topol.top, line 51486]:
  No default Proper Dih. types


ERROR 10 [file topol.top, line 63449]:
  Unknown cmap torsion between atoms 2772 2814 2816 2824 2826


There was 1 note

-------------------------------------------------------
Program:     gmx grompp, version 2022
Source file: src/gromacs/gmxpreprocess/toppush.cpp (line 1715)

Fatal error:
There were 10 errors in input file(s)

For more information and tips for troubleshooting, please check the GROMACS
website at http://www.gromacs.org/Documentation/Errors
-------------------------------------------------------

I added my dihedrals from the created prm ( charmm2gmx) along with my bonds. How would you address these?
also is there a helpful guide for adding to the ffnonbonded.itp?

I looked over another discussion

and reading the info of the errors the top is listing contacts between my new residue and the backbone atomistic contacts that are missing description that should be covered in the dih types of the ffbonded.itp
do i use similar entries to describe these dihedrals?
for example

ERROR 4 [file topol.top, line 51483]:
  No default Proper Dih. types

I see in the topology file ln 51483
2748 2766 2768 2770 9
which refers to the solv.gro
204LYS N 2746 10.735 7.696 4.086
204LYS HZ2 2764 10.981 7.390 4.350
204LYS C 2766 10.837 7.764 3.868
205GSH CA 2770 10.763 7.793 3.652

so i would look up another instance where lys is next to cys and add it to the ffbonded.itp?
otherwise build a 3 peptide chain of the residues surrounding gsh and push it through cgen to copy the missing dihedrals?