Lewis & Short

2. erro, ōnis, m. [1. erro], a wanderer, vagabond, vagrant, Tib. 2, 6, 6; Ov. H. 15, 53.
Used esp. of slaves: ut errones aliquem cujus dicantur invenient, Plin. Ep. 2, 10, 5; Edict. Aedil. ap. Gell. 4, 2, 1; Dig. 21, 1, 17, § 14; 49, 16, 4 fin.; Hor. S. 2, 7, 113.
Of the queen-bee: dux, Col. 9, 10 fin.
Of the planets, Nigid. ap. Gell. 3, 10, 2; 14, 1, 11.
Of vagabond soldiers: nec nostros servire sinant errorribus agros, Verg. Dir. 70 Rib.