When I converted my POSCAR file 2 cif file using pos2cif.pl command (vtstscript), I got the following error.
***Warning: Space group operation check failed for Hall symbol Unknown (H-M symbol Unknown).
Traceback (most recent call last):
File "/home/jkr/.local/bin/cif2cell", line 487, in <module>
cd.primitive()
File "/home/jkr/.local/lib/python3.8/site-packages/cif2cell/uctools.py", line 285, in primitive
self.getCrystalStructure(reducecell=True)
File "/home/jkr/.local/lib/python3.8/site-packages/cif2cell/uctools.py", line 424, in getCrystalStructure
eqsites = SymOpsHall[self.HallSymbol]
KeyError: 'Unknown'</module>
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