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Published online by Cambridge University Press: 20 November 2018
We correct an error in the proof of a lemma in Translation groupoids and orbifold cohomology. Canad. J. Math 62(2010), no. 3, 614–645. This error was pointed out to the authors by Li Du of the Georg-August-Universität at Göttingen, who also suggested the outline for the corrected proof.