Hi,

In both the cases i got the error as show below.
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Step 0, time 0 (ps)  LINCS WARNING
relative constraint deviation after LINCS:
max 2095.427979 (between atoms 4422 and 4424) rms
69.822533
bonds that rotated more than 30 degrees:
 atom 1 atom 2  angle  previous, current, constraint
length
      1      4   90.0    0.1000   3.5921      0.1000
      2      4   90.0    0.1000  29.8166      0.1000
      3      4   90.0    0.1000   3.4683      0.1000
      4      5   90.0    0.1470   3.7039      0.1470
      5      6   67.6    0.1530   0.1440      0.1530
      6      7   90.2    0.1430   1.8286      0.1430
      7      8   90.0    0.1610   1.2737      0.1610
....................
...................
...................
after some time segmentation fault
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Could you suggest me where I have done mistake.

check your system carefully. Maybe insufficient energy minimization? Don't forget to use position restrained MD to relax the system prior to your production MD run.
I have had no troubles with this POPC system from Dr. Tieleman's website:
http://moose.bio.ucalgary.ca/files/popc128b.pdb

Also, check out the talk on "Membrane simulations" from the Gromacs Workshop 2007:
http://www.csc.fi/english/research/sciences/chemistry/courses/gmx2007

regards

Oliver
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