Ok, I uninstall everything and start again with 1.6 ST , then upgrade to 1.7 and then to 1.91no problem with that.BUT! if i install 1.6 ST and restore my database and then try to upgrade to 1.7 the system show me the same error,this makes me belive there is a "situation" with the database builded for the 1.6 ST version. so we need to migrate that database to 1.7 and the upgrade to 1.9, anyone know if its posible to migrate database from 1.6 to 1.7 or directly to 1.9?