I get the following error after downloading the latest stable version and compiling it as a library:
aprun -n 2 ./a.out 2 in.lj
LAMMPS (5 Sep 2014)
Lattice spacing in x,y,z = 1.6796 1.6796 1.6796
Created orthogonal box = (0 0 0) to (6.71838 6.71838 6.71838)
1 by 1 by 2 MPI processor grid
Created 256 atoms
ERROR: Fix external callback function not set (…/fix_external.cpp:95)
Application 8161235 exit codes: 1
Application 8161235 resources: utime ~0s, stime ~0s, Rss ~6904, inblocks ~15536, outblocks ~38894
(aprun is a wrapper to run mpi code on a nersc/cray cluster)
I looked through the email lists and the source code but couldn’t figure out the problem.
Thank you for your help,
–Kirill