Hello! I recently started with quantum computing. I am going to run pennylane with psi4. The following packages are installed: psi4, pennylane, openfermion, openfermionpsi4.

I got an error for a simple below code when I want to invoke psi4 package:

import pennylane as qml

from pennylane import qchem

from pennylane import numpy as np

import psi4

from openfermion.chem import MolecularData

from openfermionpsi4 import run_psi4

import tensorflow as tf

import time

start_time = time.time()

ang_coords = np.array([1.360247,0.000234,0.0903980,

1.790936,-0.799199,-0.262393,

1.790957,0.797996,-0.2661300])

symbols = [“O”,“H”,“H”]

geometry = np.array(ang_coords, requires_grad=True)

import tensorflow as tf

tensor = tf.constant(geometry)

geometry_arr = tensor.numpy()

H, qubits = qchem.molecular_hamiltonian(

symbols,

geometry_arr,

active_electrons=2,

active_orbitals=3, package=“psi4”)

singles, doubles = qchem.excitations(active_electrons, qubits)

print(qubits)

Error:

TypeError: molecular_hamiltonian() got an unexpected keyword argument ‘package’

Any comments would be appreciated.

Thanks