Gunnar Widtfeldt Reginsson wrote:
Hi. I am new to Gromacs and I am following the tutorial on http://wwwuser.gwdg.de/~ggroenh/SaoCarlos2008/html/build.html#top

I have managed to get the DNA into a water box. When I run genbox I use the ffamber_tip4p.gro water model.
When I then run:
grompp -f neutralize.mdp -c solved.pdb -p topol I get this fatal error:
where neutralize.mdp is from the website above.

-------------------------------------------------------
Program grompp, VERSION 4.0.5
Source code file: readir.c, line: 1463

Fatal error:
Invalid T coupling input: 0 groups, 2 ref_t values and 2 tau_t values
-------------------------------------------------------


I have been searching for an explanation to this error but haven't found anything. Can somone please help.

Not without seeing the relevant section of your .mdp file, but it looks like you haven't actually specified any groups to be subject to temperature coupling.

-Justin

Thanks.


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--
========================================

Justin A. Lemkul
Ph.D. Candidate
ICTAS Doctoral Scholar
Department of Biochemistry
Virginia Tech
Blacksburg, VA
jalemkul[at]vt.edu | (540) 231-9080
http://www.bevanlab.biochem.vt.edu/Pages/Personal/justin

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