Erratum to "Azimuthal asymmetry in electro-production of neutral pions   in semi-inclusive DIS" published in Phys. Lett. B522 (2001) 37
  We correct our analysis of the HERMES experiment for the azimuthal sin(phi)-spin asymmetry in semi-inclusive hadroproduction in DIS on longitudinally (with respect to the lepton momentum) polarized target because of discovered misprint in sign in the paper P.J.Mulders and R.D.Tangerman, Nucl. Phys. B 461 (1996) 197. 
A.V.Efremov (Dubna, JINR), K.Goeke (Ruhr U. Bochum), P.Schweitzer   (Pavia U.)