[gmx-users] cannot determin precesion of .trn file

[kinshuk at chem.iitb.ac.in]

Hi all,
I have been trying to simulate octa-alanine peptide in a mixed solvents
like as mentioned below on Cluster of 128 nodes.
1. water, Trifluoroethanol
2. water, Guanidium ion, Chloride ion

simulation was going on properly till 26 ns.I have extended simulation to
50 ns.simulation runs properly but when i started to analyze by
ngmx -f *.trr -s *.tpr
ngmx shows some parts of trajectory not completely & then it gets crash
with the following message


******************************************************************************
Program ngmx, VERSION 3.3.3
Source code file: ../../../../src/gmxlib/trnio.c, line: 66

File input/output error:
Can not determine precision of trn file
******************************************************************************


And when i started to extend the simulation for more time with
tpbconv -s x.tpr -f x.trr -o new.tpr -until 100000
it wouldn't be able to generate new.tpr file for extended run.it pop-up
the message as below...
***************************************************************************
Program tpbconv, VERSION 3.3.3
Source code file: ../../../../src/gmxlib/trnio.c, line: 66

File input/output error:
Can not determine precision of trn file
****************************************************************************
  Earlier i was not facing this problem for extending the simulation.I
again started with fresh previous run i.e starting from 26 ns simulation
runs and when it get stopped i tried both ngmx & tpbconv the same
message have come but at different time steps.
I am not getting what's happening.

I am waiting for positive response....

with warm Regard
Kinshuk