[gmx-users] trjconv does not work!

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Hi all,

I want to extract some frames from the whole trajectory. So, I used -trjconv with (b) and (e) options.

P.S: I use the Gromacs 3.3.1 version.

But I got the following error:

Select a group: 0
Selected 0: 'System'
Last frame         -1 time    0.000

Precision of traj.xtc is 0.001 (nm)

WARNING no output, trajectory ended at 10

What is the problem?