I was performing the equilibration and minimization of ATP in namd and vmd.

This is the error message.

FATAL ERROR: UNKNOWN PARAMETER IN CHARMM PARAMETER FILE top_all27_na.rtf

LINE=** \\\\ CHARMM27 All-Hydrogen Nucleic Acid Topology File ////*

Error is showing right in the title line of the topology file. Is there any format issues ?

I have attached the topology file mentioned in the error.

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