Atomtype CR not found

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

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