Dear kwant developers, I am currently testing the new feature of kwant 1.4 - the interface with qsymm library. kag_lat = kwant.lattice.kagome() kagome = kwant.Builder(kwant.TranslationalSymmetry(*kag_lat.prim_vecs)) kagome[kag_lat.shape((lambda pos: True), (0, 0))] = 0 kagome[kag_lat.neighbors(1)] = 1 kwant.plot(kagome,site_color=family_color,site_lw=0.01) kagome = wraparound(kagome).finalized() #dispersion_2D(kag_lat,kagome) import kwant.qsymm kwant.qsymm.find_builder_symmetries(kagome) When I try to find the symmetries of the kagome lattice using the find_builder_symmetries I get the following error. Can you please help me fix this? ---------------------------------------------------------------------------TypeError Traceback (most recent call last)<ipython-input-10-b70a7b7c1860> in <module> 7 #dispersion_2D(kag_lat,kagome) 8 import kwant.qsymm----> 9 kwant.qsymm.find_builder_symmetries(kagome) /anaconda3/lib/python3.6/site-packages/kwant/qsymm.py in find_builder_symmetries(builder, momenta, params, spatial_symmetries, prettify, sparse) 449 450 ham = builder_to_model(builder, momenta=momenta,--> 451 real_space=False, params=params) 452 453 # Use dense or sparse computation depending on Hamiltonian size /anaconda3/lib/python3.6/site-packages/kwant/qsymm.py in builder_to_model(syst, momenta, real_space, params) 153 # translation vectors. 154 if dim == 0:--> 155 proj = np.empty((0, len(list(syst.sites())[0].pos))) 156 elif dim < len(list(syst.sites())[0].pos): 157 proj, r = la.qr(np.array(periods).T, mode='economic') TypeError: 'tuple' object is not callable Thanks Regards, Srilok Srinivasan