Dear all,

             I generate the ligand topology using Swiss-Param server. I generates the protein topology using Charmm 27 forcefield in Gromacs. When i am doing the Molecular Dynamics Simulation of protein ligand complex, then during the ionization step it gives a error. I also include one Mg atom in my ligand.

Fatal error:

Syntax error - File ligand.itp, line 7

Last line read:

'[ atomtypes ] '

Invalid order for directive atomtypes

Can anyone suggest me how i solved this problem.

Thanks

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