[gmx-users] about GROMPP-PR

[parinald at unsl.edu.ar]

Hello:
      When I run grompp-pr 
( grompp -f pr -c ${MOL}_b4pr -r ${MOL}_b4pr -p ${MOL} -o ${MOL}_pr )
appears:
        Fatal error: Group Protein not found in indexfile.
                     Try to use "-n" option of grompp.
what's that mean?.
To generate binary topology I must going to preprocess topology file, 
estructure file (output of EM) a parameter file, and an index file; 
how I can get this last?. Thank you.
                                     Pablo.