ERROR: Fatal error: Syntax error - File AIX_GMX.itp, line 3 Last line read: '[ atomtypes ]' Invalid order for directive atomtypes

During Energy Minimization Step I am getting the above errors while running Protein-ligand Simulation in Gromacs. I have prepared the ligand parameters from Antechamber module of Amber. Kindly help me or suggest me to overcome/rectify the above error.

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