PDB File doesnt properly turn into topology with app.PDBFile

[Dominik St. Pierre]

Hello,

i am new to OpenMM, so if the fix is obvious please don't go too hard on me.
I created a PDB file with Avogadro, which works perfectly fine in VMD or PyMOL, but when i try to open it with app.PDBFile(), it somehow only loads two of the 33 Atoms??
I attached a screenshot of the python code which shows the problem, and also the PDB File i am talking about (only not saved as .pdb, since you cant upload that here)

Thank you very much, and best regards,
Dominik

[Peter Eastman]

Every atom in a residue is required to have a unique name. Because your atoms are all named either "H" or "C", it assumes they are alternate locations for the same two atoms rather than different atoms.

[Dominik St. Pierre]

Thank you so much!!!