Running a simulation in OpenMM

An error occurred while executing the following cell: ------------------ pdb = mdtraj.load('data/native.pdb') topology = pdb.topology.to_openmm() ------------------ OSError: No such file: data/native.pdb

(simulation-with-openmm.ipynb; simulation-with-openmm_eval.ipynb; simulation-with-openmm.py)