Can't type p3ht

[StephMcCallum]

from flowermd.base import Molecule
from flowermd.base import Pack
from flowermd.library.forcefields import FF_from_file
import unyt

p3ht = Molecule(num_mols=20, smiles="CCCCCCc1ccsc1")
system = Pack(molecules=p3ht, density=0.5 * unyt.g/unyt.cm**3)
p3ht_ff = FF_from_file(forcefield_files="/home/smccallum/flowerMD/P3HT.xml")
system.apply_forcefield(r_cut=2.5, force_field=p3ht_ff, auto_scale=True)

For the minimal working example above, Foyer isn't getting the expected atom types.

File ~/miniforge3/envs/flowermd/lib/python3.11/site-packages/foyer/atomtyper.py:228, in _resolve_atomtypes(topology_graph, typemap)
222 raise FoyerError(
223 "Found multiple types for atom {} ({}): {}.".format(
224 atom_id, atoms[atom_id].atomic_number, atomtype
225 )
226 )
227 else:
--> 228 raise FoyerError(
229 "Found no types for atom {} ({}).".format(
230 atom_id, atoms[atom_id].atomic_number
231 )
232 )

FoyerError: Found no types for atom 0 (6).

[chrisjonesBSU]

Can you upload, or post a code snippet of the contents of the xml file you're using?

[marjanalbooyeh]

If this is a missing parameter issue I think Espaloma could be helpful.
@madilynpaul you already typed p3ht, right? Do you have the xml for that by any chance so that we can add it to the flowermd ff library?

[madilynpaul]

Yes, I have! I have the typed mol2 file as well as the xml.

[madilynpaul]

I think I see the problem! @StephMcCallum If you are using the espaloma generated xml file, you have to load your molecule from the mols2 file that contains the correct atomtype names. I sent you a longer explanation on slack.