Hi all,

Now I've finished two tutorials, spce and hexane.
And I'm trying to do a simple test:

I construct a small box containing 24 DOPE lipids, and did MD using Gromacs.

Firstly, I used csg_dump to check the CG mapping:

csg_dump --top testmd2.tpr --cg dope.xml 
Reading file testmd2.tpr, VERSION 4.5.5 (single precision)
I have 3096 beads in 24 molecules
I have 336 beads in 24 molecules for the coarsegraining

List of molecules:
molecule: 1 DOPE beads: 14
0 NH3 Qd
1 PO4 Qa
...
molecule: 2 DOPE beads: 14
...
334 C4B C1
335 C5B C1b
f
Everything seems OK. But when I use csg_stat to calculate distribution 
functions, it fails, leaving these error info:

csg_stat --top testmd2.tpr --cg dope.xml --options dist.xml --trj 
testmd2.trr --begin 0 --first-frame 0 --nframes 10
begin to calculate distribution functions
# of bonded interactions: 0
# of non-bonded interactions: 10
an error occurred:
property not found: step

Would you please help me to handle this problem? Thanks!

P. S. 
And I also attach the dist.xml file and the MD input file.

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