All regular Landsberg metrics are Berwald (vol 35, pg 227, 2009)

Just recently, incompleteness in the proof of the theorem appearing in the title [published in Szabo (Ann Glob Anal Geom, to appear, 2008)] has been discovered. Without this problematic part, the theorem is established only in the following restricted form: "A regular Finsler metric is Berwald if and only if it satisfies the dual Landsberg condition." The incompleteness appears in proving that the original Landsberg condition implies the dual one.