Interesting. I didn’t know an ecumenical council called by proper authority could err.
Ecumenical Councils promulgated by legitimate authority *are* infallible. I'm just not sure that Benedict is actually admitting that the Council erred....or that errors have occurred in the wake of the Council. Those two things are not the same.
Councils and popes are like football teams. There are those who move the football, those who don’t and those who lose ground. Trent moved the football, Vatican II lost ground. Yet its admirers don’t understand why the other team is celebrating.
Do you know the official Vatican II interpretation of "no salvation outside the church"? Are Benedict's recent statements in conflict with it?