Thank you for your prompt response. I have attached the cgtop.top file. I 
was trying to figure out what to add to the . top file and added the 
[defaults] segment. The initial output from csg_gmxtopol started from 
[moleculetype]. Thanks again.

On Wednesday, 24 May 2017 17:08:13 UTC-4, Christoph Junghans wrote:
>
> 2017-05-24 14:11 GMT-06:00 M. Chakraborty <[email protected] 
> <javascript:>>: 
> > I am trying to use the tabulated potential (for non-bonded interactions) 
> > obtained from force-matching to run coarse-grained simulation in 
> gromacs. To 
> > obtain the topology file I have used csg_gmxtopol.  conf_cg.gro file was 
> > obtained by running csg_map. In order to use the tabulated potential for 
> > simulation, I have made the following changes to the mdp file: 
> > vdwtype = User 
> > coulombtype = User 
> > energygrps = A B 
> > energygrp_table = A A B B 
> > 
> > 
> > I must mention here that I have mapped methanol molecules into 
> > coarse-grained particles having two beads representation (A for CH3 and 
> B 
> > for OH). When I run the command, gmx grompp -v -f cg_grompp.mdp -p 
> cgtop.top 
> > -c conf_cg.gro, I get the following error: 
> > Fatal error: 
> > Syntax error - File cgtop.top, line 4 
> > Last line read: 
> > '[ moleculetype ]' 
> > Invalid order for directive moleculetype 
> > 
> > I am not sure what is going on here. I am attempting to run a 
> coarse-grained 
> > simulation for the first time. It would be really helpful if someone can 
> > guide me to identify what is wrong with my approach. 
> The output of csg_gmxtopol is only meant as a template and "File still 
> needs to be modified by the user" (from --help output). 
>
> Can you post your cgtop.top and we might be able to help? 
>
> Christoph 
>
> > 
> > Thank You. 
> > 
> > M. Chakraborty 
> > 
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>
>
> -- 
> Christoph Junghans 
> Web: http://www.compphys.de 
>

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Attachment: cgtop.top
Description: Binary data

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