[gmx-users] g_bar Fatal error: There is no proper lambda legend

Justin Lemkul jalemkul at vt.edu
Mon Jan 21 13:33:38 CET 2013

On 1/21/13 7:31 AM, Elena Lilkova wrote:
> Dear GROMACS developers,
> I was using gmx-4.6.b3 to run a simple FEP simulation for calculating the
> solvation free energy of ions in water. The simulations run ok.
> However, when I tried to use g_bar with the dhdl.xvg files, I received the
> following error:
> "There is no proper lambda legend in file 'lambda_0.0/md.xvg', can not
> deduce lambda".

Please upgrade to the released version 4.6 and try again.  There were several 
fixes to the free energy code.  If the problem persists, please post again.

> File md.xvg is attached.

Attachments are not allowed, FYI.



Justin A. Lemkul, Ph.D.
Research Scientist
Department of Biochemistry
Virginia Tech
Blacksburg, VA
jalemkul[at]vt.edu | (540) 231-9080


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