Erratum to "Rheological properties of a nematic cell oriented in a planar manner" [Phys. Lett. A 374 (2010) 2494] (DOI:10.1016/j.physleta.2010.04.017) - Barbero, G.; Meyer, C.; Lelidis, I. (Physics Letters, Section A: General, Atomic and Solid State Physics, 2010)