[gmx-users] Reg fatal error

[RAMYA NAGA]

Dear friends,
iam doing protein-ligand dynamics..iam getting the error like this

Group Protein_JZ4 not found in index file.
Group names must match either [moleculetype] names
or custom index group names,in which case you
must supply an index file to the '-n' option of grompp.

please help me in this regard
-- 
*Ramya.LN*
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