Error While Martinizing "AssertionError"

[Harshitasahni]

INFO - general - Read 1 molecules from PDB file frame_50001.pdb
INFO - step - Guessing the bonds.
INFO - general - 8 molecules after guessing bonds
INFO - step - Repairing the graph.
INFO - general - Applying modification N-ter to residue A-ASN1
INFO - general - Applying modification N-ter to residue A-LEU2
INFO - general - Applying modification C-ter to residue A-GLY10
INFO - missing-atom - Missing atom ILE4:CD
INFO - missing-atom - Missing atom GLY10:OXT
INFO - general - Applying modification N-ter to residue A-SER13
INFO - general - Applying modification C-ter to residue A-GLY15
INFO - missing-atom - Missing atom GLY15:OXT
INFO - general - Applying modification N-ter to residue A-ARG16
INFO - general - Applying modification C-ter to residue A-PRO17
INFO - missing-atom - Missing atom PRO17:OXT
INFO - step - Dealing with modifications.
WARNING - unknown-input - Could not identify the modifications for residues [], involving atoms ['70-CD1']
INFO - general - Identified the modifications ['N-ter'] on residues ['ASN1', 'ASN1', 'ASN1', 'ASN1']
INFO - general - Identified the modifications ['N-ter'] on residues ['LEU2', 'LEU2', 'LEU2', 'LEU2', 'TYR3']
INFO - general - Identified the modifications ['C-ter'] on residues ['ASP9', 'GLY10', 'GLY10', 'GLY10']
INFO - general - Identified the modifications ['N-ter'] on residues ['SER13', 'SER13', 'SER13', 'SER13', 'SER14']
INFO - general - Identified the modifications ['C-ter'] on residues ['SER14', 'GLY15', 'GLY15', 'GLY15']
INFO - general - Identified the modifications ['N-ter'] on residues ['ARG16', 'ARG16', 'ARG16', 'ARG16', 'PRO17']
Traceback (most recent call last):
File "/users/sahni/.local/bin/martinize2", line 1110, in
entry()
File "/users/sahni/.local/bin/martinize2", line 874, in entry
system = pdb_to_universal(
File "/users/sahni/.local/bin/martinize2", line 157, in pdb_to_universal
vermouth.CanonicalizeModifications().run_system(canonicalized)
File "/users/sahni/.local/lib/python3.10/site-packages/vermouth/processors/processor.py", line 37, in run_system
mols.append(self.run_molecule(molecule))
File "/users/sahni/.local/lib/python3.10/site-packages/vermouth/processors/canonicalize_modifications.py", line 381, in run_molecule
fix_ptm(molecule)
File "/users/sahni/.local/lib/python3.10/site-packages/vermouth/processors/canonicalize_modifications.py", line 312, in fix_ptm
identified = identify_ptms(residue, res_ptms, options)
File "/users/sahni/.local/lib/python3.10/site-packages/vermouth/processors/canonicalize_modifications.py", line 178, in identify_ptms
assert len(match) == 1
AssertionError

[pckroon]

That's indeed not supposed to happen. What's your command line invocation to reach this? Which version of martinize2?