output = [site.specie.element.symbol for site in self.structure.sites]
File "/home/so87pot/n0w0f/xtal2txt/src/xtal2txt/core.py", line 726, in <listcomp>
output = [site.specie.element.symbol for site in self.structure.sites]
File "/home/so87pot/miniconda3/envs/xtal2/lib/python3.9/site-packages/pymatgen/core/periodic_table.py", line 228, in __getattr__
raise AttributeError(f"Element has no attribute {item}!")
AttributeError: Element has no attribute element!