So the code for the conductance was:
energies = []
data = []
for ie in range(100):
energy = ie * 0.01
smatrix = kwant.smatrix(syst, energy)
energies.append(energy)
data.append(smatrix.transmission(0,1)
which gave the error:
UserCodeError: Error occurred in user-supplied value function "onsite".
See the upper part of the above backtrace for more information.
