Bhawana Gupta wrote:
hello everybody,
I m sending this mail just to ask u problem which i m facing which using command for grompp prest.mdp
Error is
Program grompp, VERSION 4.0
Source code file: futil.c, line: 527

Fatal error:
Library file posre.itp not found in current dir nor in default directories.
(You can set the directories to search with the GMXLIB path variable)

That means what it says. You instructed grompp to expect a posre.itp file (which might normally be output by pdb2gmx and still be residing in your working directory) but grompp didn't find one.

They are also saying that
NOTE 1 [file *_md_water_prest.mdp, line unknown]:
  The Berendsen thermostat does not generate the correct kinetic energy
  distribution. You might want to consider using the V-rescale thermostat.

That also means what it says. If it doesn't make sense, then you can start by doing some background reading on thermostats.

Mark
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