Atomtype CR not found

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1

hello all,
i have generated the ligand topology file from swissparam, during the step addition of ions. I got error
ERROR 1 [file LIG.itp, line 23]:
Atomtype CR not found

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Program: gmx grompp, version 2020.1-Ubuntu-2020.1-1
Source file: src/gromacs/gmxpreprocess/toppush.cpp (line 1408)

Fatal error:
There was 1 error in input file(s)
can any one suggest me how to solve this error
thanks

2

Hi,
You can check if the atoms CR and the corresponding parameters are defined in the LIG.itp file or/and in the forcefield files that are included in the topology files.
I also recall that others discussed a similar issue in this forum, maybe you can find their posts useful.
Best regards
Alessandra