Unit cell parameter is zero or negative

[frgoe003]

Hello, I'm trying to run the reduce2 CLI with the flags approach=add, add_flip_movers=True, but for some systems I keep getting: ValueError: Unit cell parameter is zero or negative. Here are two examples of systems I am trying to process with reduce2: 8j3c, 4rsy

Here is the full traceback:

File "/home/fgoerlich/miniconda3/envs/docking/lib/python3.11/site-packages/mmtbx/command_line/reduce2.py", line 6, in <module> <br>
    run_program(reduce2.Program) <br>
  File "/home/fgoerlich/miniconda3/envs/docking/lib/python3.11/site-packages/iotbx/cli_parser.py", line 946, in run_program <br>
    task.run() <br>
  File "/home/fgoerlich/miniconda3/envs/docking/lib/python3.11/site-packages/mmtbx/programs/reduce2.py", line 1191, in run <br>
    self.model = shift_and_box_model(model=self.model, shift_model=False) <br>
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ <br>
  File "/home/fgoerlich/miniconda3/envs/docking/lib/python3.11/site-packages/cctbx/maptbx/box.py", line 1338, in shift_and_box_model <br>
    crystal_symmetry = crystal.symmetry((a, b, c, 90, 90, 90), 1) <br>
                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ <br>
  File "/home/fgoerlich/miniconda3/envs/docking/lib/python3.11/site-packages/cctbx/crystal/__init__.py", line 70, in __init__ <br>
    unit_cell = uctbx.unit_cell(unit_cell) <br>
                ^^^^^^^^^^^^^^^^^^^^^^^^^^ <br>
  File "/home/fgoerlich/miniconda3/envs/docking/lib/python3.11/site-packages/cctbx/uctbx/__init__.py", line 46, in __init__ <br>
    ext.unit_cell.__init__(self, <br>
ValueError: Unit cell parameter is zero or negative.