/home/ubuntu/.local/lib/python3.8/site-packages/Bio/PDB/StructureBuilder.py:127: PDBConstructionWarning: WARNING: Residue (' ', 1, ' ') redefined at line 3813.
  warnings.warn(
/home/ubuntu/.local/lib/python3.8/site-packages/Bio/PDB/PDBParser.py:416: PDBConstructionWarning: PDBConstructionException: Blank altlocs in duplicate residue GLY (' ', 1, ' ') at line 3813.
Exception ignored.
Some atoms or residues may be missing in the data structure.
  warnings.warn(
/home/ubuntu/.local/lib/python3.8/site-packages/Bio/PDB/StructureBuilder.py:127: PDBConstructionWarning: WARNING: Residue (' ', 2, ' ') redefined at line 3819.
  warnings.warn(
/home/ubuntu/.local/lib/python3.8/site-packages/Bio/PDB/PDBParser.py:416: PDBConstructionWarning: PDBConstructionException: Blank altlocs in duplicate residue SER (' ', 2, ' ') at line 3819.
Exception ignored.
DONE!