[gmx-users] Cannot find position restraint file restraint.gro (option -r).

[Dilip H N]

Hello,

1] I have installed the latest version of gromacs (gromacs 2018), and when
i give the command,
gmx grompp -f nvt.mdp -c em.gro -p topol.top -o nvt.tpr

I am getting the error as:
Program:     gmx grompp, version 2018
Source file: src/gromacs/gmxpreprocess/grompp.cpp (line 2008)
Fatal error:
Cannot find position restraint file restraint.gro (option -r).
>From GROMACS-2018, you need to specify the position restraint coordinate
files
explicitly to avoid mistakes, although you can still use the same file as
you
specify for the -c option.

2] But if i give the same command (gmx grompp -f nvt.mdp -c em.gro -p topol.top
-o nvt.tpr) in gromacs 2016.2, the compilation is working fine without any
errors.

So, how should i define position restrains coordinates explicitly..??
how do i solve this issue..??

Any suggestions are appreciated.
-- 
With Best Regards,

DILIP.H.N
Ph.D. Student