Even after including all the forcefields in the topology file still facing this issue. I am attaching the files supporting. Complex is intact with ligand but while adding ions :

gmx grompp -f ions.mdp -c solv_sp.gro -p topol.top -o ions.tpr

Facing the error

Fatal error: Syntax error - File ffnonbonded.itp, line 1 Last line read: '[ atomtypes ]' Invalid order for directive atomtypes?

Please guide with your suggestions

Thank you in advance!

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