Quote Originally Posted by Husar View Post
So when he pronounced a crusade and that everybody who joins in would have all their sins forgiven was that infallible or not?
Well let's apply the tests:
1. The Pope must be acting as the Pope. Probably, it may have been a call from a temporal power as the papacy was at that time
2. The pronouncement must be concerning faith or morals The bit about forgiveness of sins is to do with faith.
3. The pronouncement must be made in a way that makes it clear that the statement is a full, final and addressed to the whole church. I have never seen a translation of Urban's statement so I can't tell. However whatever he said would have referred to the first crusade only

I think we need a theologian to decide whether this was an infallible pronouncement or not.

why did another infallible Pope apologize for it and say it was wrong?
He didn't. He chose his words very carefully. Either he was infallible or no fool (or perhaps both). In any case I don't think point 3 would apply to his apology.