ok, I've updated the jar as explained for than link and now I'm not getting any errors any more.
thanks !
Many of the bugs you are reporting are due to bugs in the Glassfish/Weld 1.1.0 integration, and have been worked around in Weld trunk. Until Weld 1.1.1 has been released, you need to update the Weld implementation in Glassfish to use a recent snapshot. The good news, is that this is very painless to do. Instructions are available at:
http://seamframework.org/Seam3/CompatibilityHome#H-UpgradingWeldInGlassFish31
Brian