Hi, Following error is showing while adding water. Every command-line is as default except "ordered_solvent = True". I will appreciate your suggestions. "0.7 1.17367178905 0.7 1.2044634853 0.7 1.18455476555 0.7 1.21102571346 0.7 1.20890773595 0.7 1.23028004675 0.7 1.2017635385 0.7 1.2151128962 0.7 1.20672093638 0.7 1.17881942233 0.7 1.21258440895 0.7 1.21100112067 0.7 1.22101928156 0.7 1.20955876073 0.7 1.17722437184 0.7 1.19891104532 0.7 1.18433797592 Traceback (most recent call last): File "/wrkhuge/cci_apps/cci_apps_sources/phenix/phenix/command_line/refine.py", line 16, in <module> command_line.run(command_name="phenix.refine", args=sys.argv[1:]) File "/wrkhuge/cci_apps/cci_apps_sources/phenix/phenix/refinement/command_line.py", line 89, in run call_back_after_monitor_collect=call_back_after_monitor_collect) File "/wrkhuge/cci_apps/cci_apps_sources/phenix/phenix/refinement/driver.py", line 1121, in run call_back_after_monitor_collect = call_back_after_monitor_collect) File "/wrkhuge/cci_apps/cci_apps_sources/phenix/phenix/refinement/strategies.py", line 394, in refinement_machine log = log) File "/wrkhuge/cci_apps/cci_apps_sources/mmtbx/solvent/ordered_solvent.py", line 159, in __init__ use_kick_map = self.params.use_kick_maps).peaks_mapped() File "/wrkhuge/cci_apps/cci_apps_sources/mmtbx/solvent/ordered_solvent.py", line 334, in find_peaks log = self.log) File "/wrkhuge/cci_apps/cci_apps_sources/mmtbx/find_peaks.py", line 93, in __init__ crystal_gridding_tags = fft_map.tags() File "/wrkhuge/cci_apps/cci_apps_sources/cctbx/maptbx/__init__.py", line 152, in tags return crystal_gridding_tags(self) File "/wrkhuge/cci_apps/cci_apps_sources/cctbx/maptbx/__init__.py", line 158, in __init__ assert gridding.symmetry_flags() is not None" regards, Bishal Singh