The residues do not have a consistent type

Hello everyone
I wanted to do a protein and ligand simulation in GROMACS when I encountered this error, and my force field is CHARMM:

The residues in the chain THR32–HIS369 do not have a consistent type. The first residue has type ‘Protein’, while residue MSE68 is of type ‘Other’. Either there is a mistake in your chain, or it includes nonstandard residue names that have not yet been added to the residuetypes.dat file in the GROMACS library directory. If there are other molecules such as ligands, they should not have the same chain ID as the adjacent protein chain since it’s a separate molecule.

I would be happy to know your opinions and get your advice.