LAMMPS (4 Feb 2025)
  using 1 OpenMP thread(s) per MPI task
Reading data file ...
  orthogonal box = (-23.818748 -23.818748 -23.818748) to (23.818748 23.818748 23.818748)
  2 by 4 by 5 MPI processor grid
  reading atom labelmap ...
  reading bond labelmap ...
  reading angle labelmap ...
  reading dihedral labelmap ...
  reading improper labelmap ...
ERROR: Invalid range string: -1 (src/CLASS2/improper_class2.cpp:516)
Last input line: read_data labels.data
srun: error: node151: tasks 0-19: Exited with exit code 1
srun: Terminating job step 1693765.0
srun: Job step aborted: Waiting up to 32 seconds for job step to finish.
srun: error: node152: tasks 20-39: Exited with exit code 1