I am having an issue with running a simple phenix.refine that I have never encountered before. I get a list of issues and the program quits with: Traceback (most recent call last): File "/usr/local/phenix-1.4-3/phenix/phenix/command_line/ refine.py", line 9, in <module> command_line.run(command_name="phenix.refine", args=sys.argv[1:]) File "/usr/local/phenix-1.4-3/phenix/phenix/refinement/ command_line.py", line 68, in run log=log) File "/usr/local/phenix-1.4-3/phenix/phenix/refinement/ command_line.py", line 231, in __init__ reflection_file_server = self.reflection_file_server() File "/usr/local/phenix-1.4-3/phenix/phenix/refinement/ command_line.py", line 566, in reflection_file_server err=self.log) File "/usr/local/phenix-1.4-3/iotbx/reflection_file_utils.py", line 393, in __init__ force_symmetry=self.force_symmetry)) File "/usr/local/phenix-1.4-3/iotbx/reflection_file_reader.py", line 197, in as_miller_arrays base_array_info=base_array_info) File "/usr/local/phenix-1.4-3/iotbx/mtz/__init__.py", line 434, in as_miller_arrays and flex.min(column_group.sigmas()) > 0): RuntimeError: min() argument is an empty array I have no idea if the issue is with my pdb or mtz. I'm sure it's something very simple that I just am not identifying. Thanks in advance, Dennis