In the paper "Transience and recurrence of rotor-router walks on directed covers of graphs", published in <a href="http://dx.doi.org/10.1214/ECP.v17-2096">ECP volume 17 (2012), no. 41</a> there is an error in the proof of Corollary 3.8. This corollary is essential for the transient part in the proof of Theorem 3.5(b). We fix this error by constructing a new rotor-router process, which fulfills our needs, and for which the statement of Corollary 3.8. holds.
"Erratum: Transience and recurrence of rotor-router walks on directed covers of graphs." Electron. Commun. Probab. 19 1 - 6, 2014. https://doi.org/10.1214/ECP.v19-3848