about kspace error

I want to compute area expansion modulus for a phospholipid bilayer. I have been guided by the scripts from folder ELASTIC. But because I use an orthogonal box, I get:ERROR: KSpace style does not yet support triclinic geometries If I don't use Kspace, I get: ERROR: Pair style requires a KSpace style ../pair_lj_sdk_coul_long The KSpace I am using is kspace_style pppm/cg 1.0e-5 1.0e-6 I am using lammps version lammps/10Feb15 Is there something else I could change, or elastic constants cannot be calculated for a membrane using the modified scripts from ELASTIC? (I changed the files init.mod and potential.mod accordingly). Thank you,Liu Yong

I want to compute area expansion modulus for a phospholipid bilayer. I have been guided by the scripts from folder ELASTIC. But because I use an orthogonal box, I get:

ERROR: KSpace style does not yet support triclinic geometries

If I don't use Kspace, I get:
ERROR: Pair style requires a KSpace style ../pair_lj_sdk_coul_long

The KSpace I am using is

kspace_style pppm/cg 1.0e-5 1.0e-6

I am using lammps version

lammps/10Feb15
Is there something else I could change, or elastic constants cannot be
calculated for a membrane using the modified scripts from ELASTIC? (I
changed the files init.mod and potential.mod accordingly).

have you tried the latest LAMMPS version? your version is almost 4 years old!

axel.