[ALPS-users] Did not find raising and lowering operators

Dear All, I am trying to define a new hamiltonian, but no matter what I do i get into "Did not find raising and lowering operators" error. I have tried various options and it seems that the only solution is to add a hopping term that couples neighbouring sites, but I would like not to do that as it is contrary to model which I consider. I have read that wang landau deals with low tunneling efficiently but what about no tuneling?BTW: If I increase the tunneling again will QWL be still efficient? Regards, Mateusz Łącki