FFPARAM GUI important

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I am trying to work with the ffparam-gui. I am following the instructions for the installation carefully and precisely. However, when I enter the command ffparam-gui, a warning appears in the terminal saying: Warning! Root: rdkit not found. What am I doing wrong? Is there another installation tutorial other than the one in the official site? I would very much like to be helped

This question has nothing to do with GROMACS. If you have issues with FFParam, contact its developers.