Jesus Christ.
Please read:
http://catholicstand.com/defense-immaculate-conception-part-3/
As Gabriel addressed Mary as Hail, Full of Grace, how could there be sin? Wouldn’t God have want a pure sinless person without sin to bear his Son?
see the danger in self interpretation of the Bible???
That is your opinion. The original question was, does the Holy Catholic Church ever contradicts the Holy Scripture? You suggested the sinlessness of Mary. But the contraiction that we see is with your ideas, not with the text of the Scripture as written.