Hello,
I am trying run a coarse-grained simulation of methanol. I am using a two 
bead representation of methanol (A- CH3, B- OH). When I ran grompp I 
encountered the following error:


Fatal error: 
Group A referenced in the .mdp file was not found in the 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.

I consulted the hexane and propane tutorials, and realized that I have to 
provide an index file while running grompp. However, gmx make_ndx -f 
conf_cg.gro g gives me an index.ndx file where indices of [A] and [B] are 
not listed. I am wondering if I am missing a special directive during the 
make_ndx command or do I actually have to add the two blocks of [A] and [B] 
indices myself.  I am adding my conf_cg.gro and cgtop.top file for 
reference. Thanks. 
 
Regards,
M. Chakraborty

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Attachment: conf_cg.gro
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Attachment: cgtop.top
Description: Binary data

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